Still trying to wean Tiki

I sure could use some advice with Tiki. As told in previous posts, she has issues. She is the sweetest bird I have ever met. She does not bite, is very vocal (does not talk yet though). She is now a little over 20 weeks old and I still cannot get her to eat anything but formula. She is not interested in any kind of fruit, vegetables, pellets, seeds...nothing! I have tried soaking her pellets and a special seed/bean mix and still not interested. She is on 2 feedings a day. I tried last week to cut her down to 1 feeding and she started losing weight. She is very active and playful. She does have some issues with her feet because the man I saved her from kept her in a plastic box and she did not perch. She has several different size perches but she does better with the rope ones. I really need some suggestions as to how to get her to eat something. My husband is getting very discouraged and thinks maybe she is a hopeless case. He thinks maybe we should find her a home with much more experienced "parents". I do have quite a bit of experience with raising greys from birth and have never had this issue before. Please help before I have to get rid of my husband! LOL