Can't imagine how I can continue successfully though without her full support... 

They should be able to find a cancer support group with will do things like help drive them to appointments and they would also know about other support such as rent. 

Too expensive to work on rental properties.Type 2 (High Quality, Average Price)They rarely do new construction (except for garages), focus on additions & remodeling, no maintenance work.Often online advertising, may have one-person sales/bid staff, outsources design, office support typically consists of secretary and bookkeeper.Equates to a decent amount of overhead, leading to markups of 35%+.Bids: May take a while to get a bid from them because they don’t have dedicated sales staff.

Pretty sure if you can’t ask why someone needs a support animal you’re going to find the law is pretty clear you can’t ask medical questions.

If your income and debt to income ratio can support both, then yes you can. 

I then removed interior wall separating living room from kitchen and installed supporting beam.

Just make sure you can support the full mortgage payment even if you are vacant should it come to that.

The lady I spoke with today in support said they literally have thousands of complaints.

Some limited support on a one-off basis would be helpful as well. 

But when that claim can be supported, then there would be no trespass by anyone who uses it. https://www.biggerpockets.com/...As to stealing a relative's house, that too is only your suggestion.