Deb:
Still trying to get this new form figured out. I have been here all along off and on just not signed in. In answer to your question go to Pub 908, page 24, middle colum, go down about 3/4 of the way. There is an exclusion for personal residence. The way I see it you have a personal loss and personal losses can not be deducted. It would be personal residence sense her son ( a relative) lived in the home. This is the way I see it.
Basis $601591.
Short Sale $457728.
Loss $143863.
Cancled Debt $119433.
Personal loss $ 24430. I am a little rusty but I think it would go to a sch D and Cancel out.
Dale