She has been transferred to a new living situation due to health reasons and can no longer pay both her mortgage and the monthly rent at the new place.

There are also First time buyer programs in many cities and being in the Health Care industry may have options available sometimes as well.  

If you have a clean bill of health aka a title policy that says the taxes were paid, you can file a claim with the title company. 

Due to the our health care system unpaId medical bIlls are not unusual.Perhaps the property could be marketed more aggressively to attract more renters?

From there, do an assessment of your financial health. 

I am currently a Peace Corps Volunteer serving in Paraguay, South America, working on Agricultural/Environmental/Health projects in my assigned rural community. 

Our family has a four-plex that my dad is looking to give my brother and I to manage and own; so he can focus on getting promoted and maximizing his pension.

Furthermore, the better platforms understand this quandary and are unwilling to support it.For both these reasons you might want to consider promoting your project directly yourself in combination with any work you may do with a crowdfunding platform that will list your deal.

@Tyson HoseyThere is someone here on the boards who has been promoting Charlotte as a great place for corporate short term rentals.

Obviously you are not adding a bath or kitchen so it will more than likely be ok but I know here in my area the health department goes by the number of bedrooms.