I bought the ingredients for the "right" diet for Ringo, mixed them up and put what was left of her favorite cheapo cat food in, too, and put it in her dish. Other than her daily meal worms (sprinkled over her rock garden so she has to peck to get them, which keeps her beak from overgrowth), that's what she's getting to eat. She's eating. Under protest, and throwing the bits she doesn't like on the floor to make her point, but she IS eating.
I also decided, after visiting the tiels at Petsmart who were eating their pellets cheerfully, that mine should have lots more pellets and lots less seed. I bought Kaytee fruit blend for them (the Quakers get Zupreem, and the tiels steal those but won't eat them if they're in their own dishes, so I wanted something that looked different), filled their dishes with it and that's all they have in their cages. Of course, Benjy and Maggie have seeds in their dishes, and the tiel seed blend that I don't think is very high quality is in the treat cup, so the tiels (all THREE) spend a lot of time and effort "stealing" seeds to munch on, but so do the Quakers, while Benjy and Maggie put a lot of effort into stealing pellets. LOL I figure the exercise required to get into somebody else's cage to steal food makes up for the fat in the seeds, and this way everybirdy is getting a well-rounded diet. If only I could figure out a way to make Ringo feel that she was "stealing" the good food and would therefore WANT to eat it.