Reverse quit claim deed - How to do it?

good afternoon. i live in toluca lake, ca and my 85 year old grandmother lives in orlando, and she has a condo that was just fully repaired from the hurricanes that hit two years ago. the problem is that she is in a hud housing facility and the sale of the condo would remove her from it. she has, what she considered to be a daughter in orlando, who has been in her life for the past 30 years. my grandmother and her discussed that she would sign a quit claim deed over to wanda and after the sale of the property, she would give her some money and leave the rest to me, her only grandchild. well, you probably can see where this is going, now she is being very nasty to my grandmother and has hung up on her twice. also, when wanda wanted my grandmother to switch over her cd from her bank to wanda's bank, when my grandmother was asked who is the beneficiary my grandmother said, my grandson. wanda got up and ran out of the office. i work in entertainment and have no expertise in this field whatsoever, but from my vantage point there is not much my grandmother can do. but, she has been making all of the mortgage payments to date and wanda hasn't paid anything. my grandmother has an appointment with her lawyer in two weeks, and now wanda won't return her calls. is there anything that she can do to reverse the deed or something to that effect?