Not baby related but need help. Am I wrong or landlady wrong

My BFF and I rent an apartment in a private house. We’ve been there a year almost. We live on the upper floor and a few times have get togethers. I give the owners a day notice or sometimes a few days. She complains to me about noise and texts me to turn off the music or tell my guests to not make noise. There’s no lease. Just a contract we signed and each have copy. Yea she stated to respect noise ordinance early and late but it doesn’t specify exact time. It’s the weekend when we have get together but by 2am we finish. One night the power went out after she texted me some time before to lower the volume down but I have a feeling she did it on purpose. It lasted a few minutes but when I went downstairs she opened the door because she says her tv and light turned off too. But I think she’s lying and just turned everything off to prove a point. Isn’t that illegal what she did. My friends told me that. Also the contract apparently is not official because everyone I asked told me that when it’s not notarized it can be canceled out. How can I prove she went to breakers and did that purposely. The only thing she can have against me is the texts between us to lower the noise but how can she prove that too. Could she tell us to leave and us refuse? Any input would be appreciated.

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