hi Sandra, i'm wondering if she has had a reaction to the change in her food, if she was sick soon after eating the parrot mix. i would personally try her with a different brand of pellet or mix, but please remove the peanuts if they're in shells as these can cause illness in birds.
can i ask you which vet you see as at two years old she shouldn't be having problems like this, unless it is her hormones acting up. has she recently had a bad molt too which could be making things worse? if your grey is still on the seed mix i would advise to use extra vitamins and calcium too. hope all is well x