Help!!

My Fiance is doing an elmination diet. I need help I wanna make her good food but I'm not a good cook all Ive come up with is Rice pasta steamed brocolli and peas LOL. Ive tried Blueberry muffins didnt turn out right tried banana bread didnt turn out right. I can make her Sweet potato fries I can get those at the store but I need more she has 2 weeks to go and she starting to get sick of the same thing. HELP ME!!!!