Look at the absolute worst month and see if it was still positive. and 11cap is pretty high unless you are in a war zone, I would double check all those numbers and all your expenses, but if they still pan out, I would pull the trigger.

That's a pretty extreme view even for the worst case scenario.

Not renewing would be the worst decision here.

As they say, every worst situation provides big opportunities... 

q=eidl+sba&sort=new

She also offered to do a 6 month lease now but that would land us right into the worst time, November, if she does move. 

You'll probably learn a lot from their perspective on that.It's rare for that kind of vacancy to exist without some sort of systemic issue.

Worst they can do is say no.

She’s on time with all the payments an even gave them proof of her taxes being filed an when they should be here.It was a rent to own agreement, I’m confused my self do to never having any issue of the sort.

Another option is to negotiate some sort of rent guarantee by the seller for a specific amount of time post closing that allows you to have a runway to replace a tenant or two if needed that first year.