I'm actually kind of amazed by some of the responses in this thread.
First off, nobody here has the right to comment on a psychologically damaging situation to any captive exotic animal. Along with this, claiming that 'primates shouldn't be pets', that is amazing.
Why doesn't anybody have the right to comment on the psychological ramifications of captivity?
I'm just going to take a stab in the dark here and guess that it's based off some "You don't know what the animal is thinking!" mentality. Which is just wrong.
Animal behavior is pretty well understood. Amazing, fascinating stuff and there are constant advances as a result of newer, better, stronger faster technology but the foundations haven't changed. Animal behavior is understood and understood well. Brain function and chemistry is understood, instinctive responses and environmental pressures are understood, the reason animals act the way they do and predictions for how they will respond to situations are all pretty clearly understood.
Some of the people defending this woman's actions clearly don't have access to that information and wish to rely on their uncertainty and anthropomorphism as a warm fuzzy blanket that insulates their argument from the cold truths (and boogie men) that have been provided to counter it... but they're wrong. The personal abject ignorance of animal behavior on the part of an observer doesn't invalidate the knowledge of others.
Keeping a lemur- an intelligent, active, highly social animal that has evolved to fit into a complex behavioral hierarchy- in an environment without any other lemurs is traumatic and damaging. It's animal abuse. It serves no purpose other than the gratification of the abuser and it shouldn't happen.
As to lemurs being pets... More often than not, the overwhelming majority of the time, they should not be- for exactly that reason. If someone out there really has the time, space and money to provide a suitable environment for them (three thousand dollars is not cutting it, that's laughable) and wants to keep twenty-fifty of them in a climate controlled, positive stimulus carefully balanced group in an enclosure bigger than most of our houses... nifty, have fun provided you have met the local legal requirements for doing so. Shoving one in a diaper and keeping it in a bird cage is not that though.
On a forum which regularly deals with much, much more dangerous animals (alligators? venomous snakes?) I'm amazed that anyone can call a judgment on someone for wanting to keep any animal.
Wanting to keep an animal and keeping an animal are very different things.
The needs of the animals people here keep are being met. Mostly anyway, obviously there will be some registered users out of the fifty four thousand who are not providing appropriate care... but most are. That means they are providing the correct environment, the correct diet, appropriate health care and appropriate behavioral stimulation. A venomous snake is actually pretty easy to care for with a little bit of planning and preparation. It's a lot easier to keep a hook and some locking cages than it is to keep twenty additional lemurs. Both are required, for their respective species, to be keeping the animal in a safe and appropriate way.
And for what it's worth, most people shouldn't be keeping alligators either. For some of the same reasons they shouldn't keep lemurs... the space and expense required to do so exceeds what most people are capable of providing.
I can understand if she was keeping an ape. Lemurs are not apes.
I don't recall anyone saying they were apes. Primates... not apes.
Where's your personal cutoff point for feeling it's necessary to meet an animal's behavioral needs before you're willing to abuse it? I'm guessing you don't think it's okay to mess with chimps based on the ape comments, but you clearly feel it's okay to isolate a lemur until it's utterly broken... Where do you draw the line? Someplace in the middle of monkeys? Gibbons?
You obviously subscribe to a different set of ethics than I do. I won't even keep schooling fish isolated.
I'm not going to tell someone what animals they are and are not allowed to have. I'm not going to pass judgment.
I don't think anybody said she wasn't "allowed" either. The law for her state says she's allowed... people have just commented on weather or not she
should based on her ability to provide for the things it needs to stay healthy. She can't keep it healthy, she
should not be keeping it.
You, as the owner, should be committed to doing what is best for the animal. NOT what makes you sleep better at night.
And what is best for a lemur is being in a large group with other lemurs. Behavioral health is part of "health."
I'm not going to patronise this 'crazylady', I think she needs some help with understanding these animals and how to more properly care for them. Insulting her, calling it 'cruel' to own a lemur, and then turn around and give a snake barely any room to move around- that's so hypocritical it's laughable.
People have called it cruel to own a lemur
in the manner she has decided to own one.
And calling her out on not providing for the needs of this animal while maintaining other animals in a manner which meets all of the requirements to keep them healthy, physically and behaviorally is only hypocritical if you're profoundly stupid and have no knowledge of biology.
The needs of one species aren't identical to the needs of another species. In this case, the animals you compared are vastly different- the upper echelon of intelligent mammals is going to have more complex behavioral health needs than the least social, least active, least intelligent of the reptiles. It's like comparing apples and... algae.
how lucky you must be to just be you! how do you ever put a hat on that big head of yours? since you are just so perfect and never wrong it must be great behond compare. how do you even wake up in the mornign without looking in the mirrow and telling yourself "im just the biggest 
head of all times!people of your statue ned to be put on a shelf and not alowed to speak!