how to deal with a messy roommate ?

G
My cousin is staying with my parents and I, she stays in my room w me. I'm not OCD but I don't like my room being messy AT ALL whereas she'll leave things wherever. She'll wash her clothes & doesn't put them away, just leaves them in a bag in the corner which bothers me because my room is already crammed as it is. I have told her many times to be more clean but she doesn't listen. I've told her to at least fold her blanket when she wakes up so that my room will at least look somewhat clean & she doesn't. I'm tired of cleaning up after her & we can't just "kick her out" because she has nowhere else to go. Any help or advice please??