Less is more with this kind of tenant so limit communication, use the broken record technique when you talk to her (repeat yourself) and acknowledge what she says.  

I've been at this for a while and I can sell most of my properties using simple techniques that don't include real estate agents.

With all the different marketing techniques available to us today.

Many of these techniques listed have a fair amount of industry specific knowledge that you would want to familiarize yourself with prior to jumping in. 

You cant give the tenant that much power over youBest technique is to be firm but professional and dangle the deposit in front of them if they just get out now and with no major damage.

I could stay nice and smile and just use the broken record technique, "No, sorry, hon, I don't accept people who don't make 3X the rent.  

Then, they'd usually want a request via fax on letterhead, which I did not have, as a resident manager working for an old fashioned owner.Other than using other good sleuthing techniques and credit, criminal, eviction, employment checks - your next best defense is a month to month agreement.And remember that you can deny them for nearly anything you can think of.  

I have heard from experienced landlords that it is often better to NOT let the tenant know that we are "owner/landlord", but rather that we are "just the PM" or even that we "just work for the PM".That way, it is easier to manage the tenants when they make unreasonable requests, we can just say "Sorry I can't authorize that, I just work for the PM" and we are not seen as the "bad guy" in the scenario, the unseen owner takes the blame.I wonder if this technique makes sense in a house hacking situation?

Yeah, I had one broker actually call and pretend that I'd agreed to bring an "executor's deed" to my hearing for my mother's probate (they get the court filings, which are public), and say that I need to be sure to have it in hand at the hearing, and some other garbage basically presenting herself as a legal expert - I reported her to the state bar as someone practicing law without a license and reported her to the state realtor's board, too.There are serious consequences for people using predatory techniques to prey on people who are grieving or aren't savvy about real estate deals or who are uneducated or seniors, etc. 

(the reasons why they want you to bend your rule for them)...You do the nice, smiling but broken record technique on them, "I hear what you're saying and I know you find it frustrating, etc., but that's our policy and we can't make any exceptions."