I need help!!?

My Friend keeps sleeping at my house naked and it bothers me since my mom make me sleep in the same bed as her she alwayse ends up my leg I tell my mom and she doesnt belive me and I tried to go sleep somewhere else but she fallows me then my mom gets mad at me because I'm not on my room what can I do >.< btw I'm 13 andmy frind is 13