There is a possibility that it could be Vit B that is in short supply. Your AV can say for sure and rectify in the short term.
Foods rich in Vit B, choline especially are spinach, beets, poultry (does she get any chicken?), pasta, yoghurt, cheese, eggs and rice to name some.
Do you feed any pellets?
Might be worth making sure she has enough to do, going down the 'I'm bored' route, plenty to do and chew is advisable. If it does turn out to be this how about hiding some treats in her cage?
Hope you find a definite answer