(Loud or noisy, rude behavior to others, etc).

Also, allow dogs.

We have seen a clear change in guests behavior mostly when it comes to how far in advance they feel comfortable booking (used to be a couple months and it's now a few weeks to just even a few days before), their expectations as far as cleaning goes and also the length of stay (more and more work-cations so we had added desks to every bedroom as well as upgraded WIFI) .

Bird dog and develop the skill of finding real deals.

Put a big dog bowl out, big boots at front door. 

Another simpler option is your husband could charge a "bird dog" fee. this is simply a fee for finding a deal.

Residents will also have access to onsite meals, WiFi, toilets, showers, mental health/housing support, job training/placement, and a small dog run.

In my expensive market, bird dogs start at ~$5k.  

This is a mental health issue and until she recognizes she needs severe help, nothing anyone says to her will change her behavior.

Try bird-dogging/driving for dollars for a local wholesaler.