I have a female with this problem, and there's really nothing that you can do. If it seems to stay the same even through soaking and shedding than it's probably a blind eye. To tell you the truth I wouldn't bother with it as you can often deflate an eye trying to remove something which can lead to bigger problems.
If it's not infected, and isn't a stuck eye cap I'd have her checked by a vet but it's probably just a blind eye which if she's eating and what not then it's not a big deal.
Hell my girl with one eye is probably my favorite snake ( out of over 100 )