Make it easier for her and easier on yourself by not setting the bar so high that you can not accommodate this type of scenario.

Our "all-stars" receive special benefits such as having their unit upgraded first when we do upgrades, special requests are more often accommodated, and occasionally we give them a special thank you gift.

Obviously, the contract would need a little tweaking to accommodate such things but that is not all that hard.  

My gut told me that I needed to ask the belligerent tenant to leave asap (I am very accommodating to tenants' needs, but this woman also had some mental problems). 

The bathroom it needs some space if it will one day accommodate someone assisting the aging parent. 

We were happy to renew, until we heard about this new situation.My husband was considering just raising the rent to accommodate all of these people, with the other option being to just refuse to renew.  

When I paid $1,700 rent per month for a 3/2 view house in Sausalito in 1994 and then when I bought a Mill Valley rambler in 1997 for $450,000, all of my friends/family/associates who lived outside the Bay thought I was nuts to pay such a huge sum for such modest accommodations. 

The page goes more in depth:"Landlords must reasonably accommodate the needs of disabled tenants, at the landlord’s own expense.

If the house has sufficient bathrooms to accommodate the larger group, fine.

Check them out by searching the BP site.... key words "service animal" "emotional support animal" "companion animal" "disability" "accommodation".