My fiancé wants his mother to marry us but I don't feel comfortable: Advice?

My fiance and I are set to get married next year. His mother can marry people…he wants her to be the one that does it for us. But I don’t really like her. I don’t want to make a big deal about this, but it is my wedding too, and I don’t want to feel uncomfortable. She has made it very clear that she does not like me and has even said in the past that she hopes we do not go through with the wedding. Like do I just get over it or do I say something?

I feel you. If there is no way you can fix things at all, then I get not wanting her to do it.