how to get rid of an annoying roommate??

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i have this friend who is currently bothered by how she could get rid of her roommate who is her cousin. her roommate calls her mom everyday to report the "annoying stuffs" she made that day or the day before that,,, that my friend's not studying and all she does is texting, and facing her laptop, so everynight, my friend ends the day up having his dad talking to her, or should i say scolding her over the phone, **that sucks**