She's willing to pay the rent for the next two months to be a PITA, that is her choice.Inform her in writing the need to keep the AC set to a minimum level to protect the health and safety of the property even if she is not living there.

What you do have to check into are the limits for staying so that you don't lose your Canadian Health Insurance.

Can you afford to hold on till it's a better market?

@Kyle HunihanPA offers affordable housing, rising rental demand, and proximity to larger cities like Philadelphia.

Prices have gone up too much post divorce and she can’t afford to buy back in now retired. 

But you have to be careful as they could be dangerous for your financial health if not used properly.

Loan Term and AmortizationCommon Term Lengths: Loan terms for seller financing vary but often range from 15 to 30 years to keep payments affordable for the buyer.Balloon Payment: Many seller-financed deals include a balloon payment due in 5 to 10 years, at which point the buyer would need to refinance or pay off the remaining balance.

(As a landlord, I always do best to fix any issue.. other tenant live without any complain and she is the only one...she say she will report health department etc..)Sametime, She keep saying  she want to move to another apartment (1fl for her mother as her mother has some disability ) she wouldn't leave.I didn't like turnover and it is section 8, I was going to let her stay til she find the new home.

A lot of investors based in markets like Miami are choosing to purchase their investments OOS in the Midwest because of the affordability and numbers making more sense.

I'll add one more: buy the best quality you can afford at the time.