Leave or tell her she stinks

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There’s nothing wrong with questioning or honesty

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You should sit them down and just be honest. “Hey! So there’s been a bit of a smell lately, and I just wanted to make sure everything was okay? Were roommates do we gotta look out for each other. Maybe we could do a deep clean of your clothes? Check your hygiene supplies and see of it’s one of them?” Potentially offer to go shopping with them for new ones? Some people just were straight up not taught how to clean themselves of their stuff, so you might need to teach them how to.

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Say you got a 2 pack of deodorant but you only need 1 so hand her the other

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