Grandma has dementia - mom in denial (with a legal question)

My grandma (97) has dementia, I don’t know which kind as she doesn’t have a formal diagnosis, and my mom (77) is totally in denial. She admitted one time that she was afraid to end up the same way and I think she’s heading there faster than she realizes.

Most days my grandma asks for her mother and wants to go “home”. She admits she’s unsure what “home” is but she definitely doesn’t want to be in the nursing home.

She recognizes me but doesn’t quite know how I fit into her life. She doesn’t remember my mom is her daughter.

There is no legal paperwork in place and no power of attorney. My mom seems to think she can get a notary in to see my grandma and have her sign over her affairs and let my mom sell her condo. But grandma doesn’t even remember the town her condo is in…. Am I right in thinking there’s no conceivable way a notary would have my grandma sign away everything under these circumstances? Or would a notary consider that ultimately my mom is the sole beneficiary and it would help speed things along.

My mom is in the beginning stages (I think) of dementia so she’s extremely argumentative, childish and stubborn. Not to mention extremely self centered. The whole situation is painful and exhausting. Thank you