Baybi came first. If anything, Amber should be the one to go.

Amber is making Baybi feel uncomfortable, although Amber is just going on her instincts, Baybi is not the wrong do-er.

The *right* thing to do is to not allow Amber access to your room, not get rid of any of them. However, it seems that's not possible if your parents aren't willing to move the litterbox/food anywhere else. A litter box can easily fit in the smallest areas - bathrooms, closets, under tables, etc. Same with food bowls. My brother's cats are fed in a closet.