I think my cousin is a skeezer
What do you mean she's a skeezer?
She invites me to the movies without telling me what she wants.
If you don't get along with family members then you should distance yourself from them. Just because they are family doesn't mean you have to hang out with them.
I don't care what she wants. I'm going to tell my aunt.
If you truly feel she's up to no good, maybe talking to her mother is a good idea. I hope it works out.