Other family has shut us out. My grandmother who has capacity has taken out all her anger and frustration on my mother. My mother is very hurt. Her brothers "have taken over" but there is still no one to care for my grandmother. Is there help for my mother to get a hold of understanding what has gone on wasn't really her fault? She loves her mother, but received no support from her siblings. It's taken a toll on my mother. She needs help!
Otherwise, if your Mom becomes her Mother's full-time caregiver than could become a 168 hour week with zero breaks. At Assisted Living, the staff works their shift, go home to rest, and come back refresh for their next shift. Your Mom would never been rested and refresh. Plus Mom would feel shut-out from the rest of the world. Her own health would decline and she could become one of the 40% of caregivers who pass away while caring for a loved one.
Maybe your Grandmother is pretty smart, maybe she wants to go to Assisted Living thus not wanting to put her daughter and sons through all that at-home care. That is why she kicked your mother out. It's a wake-up call.