@JennS I know there are healthier pellets, but mine is so enthralled with Zupreem, I have left him on it for 20+ years. I believe Harrisons to be healthier, but since pellets are only 1/6 of mine's diet, I have kept his old favourite pellet mix anyway. But if you can get yours to accept Harrisons -- that's great! Mine does receive a lot of fresh fruit/veg plus rice/pasta, so I let him keep enjoying his old Zupreem pellets for snacking and enrichment purposes.
Matilda actually taught me a lot: ask more questions, never assume or presume! So glad she's rallying so well! Hugs and scritches to this poor dual-feather injury princess. Delighted with a happy ending.