I use coconut oil on stuff like toast, or I use humous on plain bread or crackers or for a mayonnaise substitute.
Lidl's less fat humous is very good, and it's not full of salt or garlic, and it's cheap enough to try, and if she only eats a little of the tub, it's not expensive to throw it out.
Coconut oil I just keep in the cupboard and it spreads like butter then.
Of all the dairy free, soya free, margarines out there, the tastiest one is actually among the cheapest. Vita-lite is fine, and it's very good to use in baking, which can't be said for a lot of the others.
Her diet is very do-able, it only becomes a problem when other folks have to feed her. It's one thing to be vegan by choice, but it's another when it's a health issue for a child.
Very best of luck with it...and if you want recipes, I have a shelf load of books on the subject.
M