I would look at distressed landlords who were strapped by the eviction memorandum and are motivated to sell.Contract: google WB-11.

Is there any chance she acknowledged that in writing by email, text, or something?

This tenant has been super difficult to communicate, when I send him text he simply ignores the text and does not reply, does not call back etc.

What questions should I ask the motivated seller in order to present the most essential information for buyers?

One property listed for rent drew 150 calls/texts/emails in the first two hours. 

I would say something to the tenant (text or e-mail-wise) similar to: Please let me know when you would like for me to pick up the signed lease.

I bet that if you text or call a few of the agents you know (or if you contact a few in our investor-friendly agent directory here) that they will get back to you promptly and you will be glad you worked with an agent rather than trying to close a property on your own. 

That is why I said to text the tenant a synopsis of your conversation asking if what you texted is correct.

The majority of them aren't really motivated, some I lose to competition. 1,000 letters really isn't a high volume even when you're using a targeted list.

Maybe you even have her signature somewhere or a text or email that says she approves it?