And if you rent to who is the given number of square feet, & then once living in the Rental, invites into it, GOD-only-knows-how-many-live-there increased tenants; they you mostly only course is to evict everyone, who lives there, as means to end this abuse.

If she has a good credit rating , shes probably not stupid and will be aware of her limits to abuse you guys.Hang in there.

I smelled alcohol on their breath during their visit so the "I have mental health issues" could be some substance abuse.

Is there a strong way to screen for drug or alcohol abuse prior to signing a new tenant? 

Free utilities will likely get abused, youll be the neighborhood's free laundromat.

And even then, you have the right to say no if the animal is not a "reasonable" request.No need to get bulldozed by people abusing the laws. 

Sadly, there is a large percent of people, I think, who enjoy the power of being a landlord, and abuse it. 

But @Joe Gore , just because courts are properly piercing the veil in cases when people abuse it does not mean that it is worthless for people who don't abuse it.  

This is so interesting to me  Go to jail for rape, battery, child abuse....come home to housing benefits if you're eligible.  

Tenants will abuse them and you'll get called to remove the beans they tried to grind and you'll have to clean up a nasty mess.Honestly, you won't need many tools for basic maintenance.