Apparently you shouldn't, considering you go on to mention you already have two males of your own.
Tittled? Does that have something to do with canine mammary glands?
Honest question here, why is a male dog 2 months shy of 2 years old too young to breed? All he has to be is a sperm donor, surely a 2 year old can handle that.
For money obviously, she stated she'd take cash as a stud fee. The fact that this reason may be unacceptable to you, me, or anyone else, makes no difference.
Hence the reason you should have no need of a stud dog.
I fail to see any can of worms that has been opened let alone a HUGE one. She was offering a doberman for stud nearly 2 YEARS AGO. I can offer a mutt dog from the pound as a stud and it's no one's business but mine.
Perhaps this dog is registered, perhaps it's not. Either way, a title, pedigree, or anything else is not an absolute prerequisite to being allowed to reproduce.
The vast majority of people looking for a stud would require registration papers and if she doesn't have those she's unlikely to get anyone interested in using her dog. Either way, having a pedigree or not is largely irrelevant, and if it is an issue it is between the two parties involved.