Any ideas on fall prevention? Please help.

My mom had a stroke last year which left her with left side neglect and vascular dementia. This causes her to have no insight or even realize that she is a very high fall risk. The main issue is through the night she does not remember that she should not be getting up on her own and forgets or doesn't realize she should be calling to me to help get her up for bathrom runs. I have tried pillows and then putting a chair beside her bed to keep her in or at least trying to get out of bed. I have tried alarm that the use in hospital but she will either take it off or it will go off cause she moves in bed then that wakes her up.

Oh I have a small bed rail but that does not help. We have resorted to watching her on monitor but someone has to watch it in cause she tries to get up and I'm worry she will fall. any suggestions? thank you