But, she has a history of denying fault (eg: noise with guests and smoking) so I want to approach it with caution.

It does show a lot of pipe history, lol.

Pre-approval involves a lender reviewing your financial information and credit history to determine how much they are willing to lend you.

This past year, I began requested a master credit card to keep on file, with a signed consent form to authorize the credit card use, by permission. 

Do you pick the first applicant or the one that has the best overall history?

Know your customer is not a badge or authorization to play detective or law enforecement.

Heard that they have the legality to do it due to loss of cause, but the banks don’t usually do it if the borrower has a good record in paying their debt with good credit history.  

The house has been owned and lived in by extended family so has no rental history.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

ONE, I can find ONE event and one only over my entire lifetime that actually did smack the R.E. market down and that took the largest financial event in world history since the Great Depression to do it.