Bradtort is on track. I agree, but would suggest you keep trying a wide variety of "favorites" including yellow flowers i.e. dandelion, coreopsis, pansies. Try grating up some bright yellow butternut, banana, pumpkin squash. I rehabbed a tortoise in poor health that was fed nothing but lettuce, it was habituated/addicted. It refused everthing I offered. So, I hibernated it for couple months, and it emerged a ravenous eating machine, problem solved. If yours is in good enough health come Fall, you might want to try a hibernation and see if it emerges with a less fussy attitude... Good luck