Yes she's a meat eater, she enjoys most things but is allergic to apple and egg
She can eat any meat she likes, beef, lamb, chicken, pork, turkey, whatever
She can eat any sort of fish or shell fish
She can eat most (but not all) vegetables. (avoiding most root vegetables for now)
She can eat salads, tomatoes, mushrooms, peppers
She can use olive oil as a dressing, or real mayonnaise such as Hellmans Real Mayo
She can have bacon
She can have sausages (but best stick to the very high meat content ones such as Hecks)
She can eat any dairy foods she likes - butter, cheese, full fat yogurts
Basically, it is carbohydrate that is the problem, especially bread, pasta, rice, potatoes, breakfast cereals and flour (including all the wholemeal varieties) We also need to be very careful with fruit and milk. All carbs turn to glucose once inside the system, so need to be reduced.
Being diabetic doesn't mean she has to starve herself. I suggest she buys herself a blood glucose meter and starts to test herself at home. Testing before and after meals (2 hours after first bite) will show her what that meal has done to her levels and how her body has reacted, giving her a chance to change some of her choices.
This forum is an excellent place to learn, and we can provide links to other websites that may help.
