Hello, Been watching how poppers is doing and I feel for you. I had a 13 year old love bird that use to have the exact same symptoms, go all stiff, no movement etc, would pet and snuggle him and he would eventually come out of it and be fine again. He never did get the full use of his right side again but he lived for another 4 years before he peacefully passed in my arms. Got his appetite and curiosity back but would have these seizures sometimes daily then good for a few days and start all over again. He used to get around fine walking/stumbling down the hall looking for me when he would hear me come home. He became my second skin. To the point I had to sneak into the house so he would not start calling and come looking for me if he heard me. We did not have any vets nearby where I lived then so never did get medical help for him, which I always wonder if it would have made a difference considering how long he lived. You are doing everything humanly possible for her which I applaud you for! She truly is your family.
Just wanted to share that though it’s a different species and all, do not despair, she may be with you for years to come and not really notice/remember that she is now different. My baby just adapted and kept on boogieing. Going away for a few days camping and taking kiwi with us again, so will drop by the avenue when I get back!! All the best to you and all!!