Pancho sounds just like Cricket. When Cricket came to us she was she was on a all seed diet, over weight, could not fly, was kept in a small cage and was very nasty.
She did bond with me very quickly and the family with in the first 3 months We did take her off seed and put her in a large cage and that was the first thing we did.
Like I said she bonded with me very fast, but it was over two years before she would play with toys.With a good diet her weight is down where it should be and she can fly and has turned out to be a great part of the family, it just takes time. Even today she will do new things she never did before.