There are many good vegan/veggie groups on fb. From your choices;
Chicken curry-make a separate portion, omit the chicken from her portion and replace with chickpeas, firm tofu, quorn chicken pieces...
spag Bol, same, use veggie mince in hers or in everyone's.
cottage pie, same, use veggie mince in hers or everyone's.
roast dinner, as long as you're using a non-animal fat, give her same as everyone else bar the meat and use a meat alternative, linda mccartney sausages or a veggie burger. If It's a special occasion Holland and Barrett do a vegan roast meat alternative.
pizza and salad-if she isn't vegan just make/get her a veggie pizza? If she IS vegan, buy a base and use vegan cheese and just don't use meat as a topping or if you're feeling fancy chuck some quorn pieces on it.
Ready meals, I am not sure but I figure if you cook up some veggie meals and freeze them then just chuck them in the oven/microwave then that's an alternative.