To be protected class of person, the support animal must be there to give assistance to a diagnosed mental disorder of the person or a diagnosed emotional disorder. 

Remember that hoarding is a psychological disorder and usually their attachment to the stuff leaves them attached to the unit.

I'm sure your doctor has already informed you this is very likely a classic presentation of general depressive disorder, a lifelong condition.

That mean that she has a severe mental condition, (bipolar disorder, major and chronic depression, severe eating disorder ect. ) she then has to demonstrate that the cat performs a service that helps her condition.

In my town the property owner can be cited for "keeping a disorderly house" (party houses).

Send a notice to cease and cite disorderly conduct which is a legitimate reason for an eviction...Obviously you need to follow procedure notice to cease and if the behavior doesn't cease follow it up with a notice to quit and file for judgment for possession based on these grounds...Also add a statement stating nobody is allowed up on the roof!!!  

@Ginny WestThe tenant downstairs needs to be arrested for being "drunk and disorderly".

It's almost like Post Traumatic stress disorder with my experience with credit and financing.

Drunk and disorderly conduct in public?

I'd be surprised if he allowed any disorder from the pets but I won't know until I look into it.