I'm not going to comment on whether she is or not.
I'm vegan (lactose intolerance) and one of my family is coeliac.
When we are all eating together we eat:
Rice and veg curry (various curries, check out vegan Indian cooking)
Moroccan tagines with gluten free bread (again, lots of tagine recipes online - I like a chicken and olives one which I change to be tofu and olives)
Risottos (pea and mint, mushroom, etc)
Jacket potato and chilli/ratatouille/home made baked beans
Pad Thai/Thai green curry
Egg fried rice with mixed vegetables
Stir-fry with rice noodles and veg
You can get gluten-free pasta and do vegan sauces - tomato and basil, roasted veg, vegan sausages etc.