Ok! So I have this neglected parrot?

On Easter Sunday I managed to end up with a 16-17 year old alexandrine parrot that spent its life in a small cage and ate only sunflower seeds

Here are her signs of sickness

- feather plucked around her abdomen to the point where it's permanently bald and has quite a few feather cysts, some feathers have burst through them though , she's stopped feather plucking since I got her

- she's VERY underweight , as in when u stretch her wing out you could swear that the bones in her wing are on the outside of the skin

- her skins quite dry and flaky

Since I got her ive switched her onto a vegetable and small parrot seed diet , she's also got a vitamin, mineral and amino acid supplement in her water( dw I kno you have to change it very often to avoid bacterial over growth)

I give her dried fruit , pasta, egg , plain chicken etc but she only eats vegetables and fruits mostly

The only improvements I've seen in the last two months that ive had her is shinier feathers and feather regrowth, I don't think she's plucking anymore

Any advice / tips on what else I could do for her?! There's no avian vets around her n the vets Iv spoken to have said to just keep doing what I'm doing and to talk to other bird enthusiasts