Serious question time Aunts and Cousins

I've been looking up something and came up with nothing. Actually not what I was looking for.

The question is...

If when my mom married my dad and my aunt likes a cousin on my fathers side and they marry what would that make her? I know she would be my Aunt but would she also be a Cousin in Law?

Also would that be permissible by law? I know where we talk about where we marry our cousins but I've not been able to find anything on the other side of the family.