I don't know if it's too late, but be nice, but not accomodating. If she needs help with luggage help her out, if she starts implying or demanding you need to wait on her because she is tired (ie too tired from partying) just tell her something like that's too bad, and walk away. If she tries to start a fight because you walk away tell her it's because you are learning to detach from here, and that includes "over helping her"
