To be real, some people don't want to own a home. Lot of work comes with it. Also, might not be there often.
Also, she might own several homes and just rent them out. If you getting passive income from each home, that will take care of the mortgage for each home. Then you will also have a surplus in money from each home that will cover some or all your rent for your apartment.
Or she just may have a lot of disposable income to where she just wants to pay for convenience and a nice view in the heart of ATL