Someone explain why my landlord won’t kick out my flatmate Harassing me?

My housemate that I’ve lived with for a year now is noisy she won’t let me sleep make food popcorn microwave late at night 1-3am and keeps harassing me I’ve written to the landlord 5 times and I was given a warning?

Someone explain why my landlord won’t kick out my flatmate Harassing me?
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