It sounds like P.T, get her to a vet so you can get a diagnosis. My old rat Harry had PT when he was only a year old and there is nothing you can do about it. I think females are more prone to PT as well so it most likely is PT.
If it is PT the vet can give her a steroid that will help her get back to normal, but she will die of it eventually. You are only prolonging her life for about 2-3 months. I know your pain, losing one is always heartbreaking. But just make sure she gets extra extra love and attention because she doesn't have long.
If it is PT the vet can give her a steroid that will help her get back to normal, but she will die of it eventually. You are only prolonging her life for about 2-3 months. I know your pain, losing one is always heartbreaking. But just make sure she gets extra extra love and attention because she doesn't have long.