The Tortoise Table

Hello, I want to know if my turtle is sick, is it due to shell rot or something else. I've raised her since she was just hatched. Now, she 's 15 years old. She ate once every 2 days, 2 carrots, some lettuce, some white toppings. fish, gammarus and crickets, rarely, once every 2-3 weeks I give her 2 ...