Have tenant live rent free for a month

[Sandy Gabin]

Hi BP family!

I have inherited a tenant that has cancer, smokes and has pets. I spoke with her yesterday because she was nice to pay the rent for this month. We are going to meet this weekend, and since she lives month to month, where there is no lease, I was thinking that my last option would be is to have her not pay rent for the month of August, and she could hand me the keys by September 1st. My question is, should i have a letter notarized and an attorney stating that she will not pay rent for the month of August but she would have to hand the keys by September? Or just do a formal letter where i sign and she signs take it to the notary and then we are good to go. I would really appreciate your advise.