Can she cook? When I went vegan, the first thing I did was learn to cook. Apart from being able to feed myself, it also means I know what's in everything and know what to go for.
Has she contacted Spanish vegan groups? There must be some and they'll have knowledge relating specifically to Spain.
Didn't mean to be mean.
Loads of good ideas for recipes on here (really helped me :)
Big-up for your relative and you for helping.