its looks root bound if you do not have a bigger pot carefully lift her out the pot when she is 100% dry and fill the bottom up about 1/4 of the way up or untill she is level with the ring of the pot that should give you a bit more room and when your done give her a 3 gallon plain water flush.

do nat add anything until after you flushed her out and let her be for a week and see what happens