Our family has been told our Mother who has been in the...

Our family has been told our Mother who has been in the local Long Term Care Facility for 2 years now she has advanced Dementia with psychosis, quite possible Vascular Dementia, but she has over the past month started with severe agitation, hollering as one example "help me" over and over even with us around her but she can not tell us when asked what is wrong and what she needs help with, she will say, "I don't know". The more agitated and upset she gets her hand and arms will tremor terribly and then she gets upset about that and starts hollering, "make it stop now, please make it stop". Her physician has tried 2 different medications in the Benzodiazipene family without success, now has put her on an Anti-psychotic med called Zyrexa, this was just started 3 days ago and is expected to take up to a month for any noticeable improvement if she will have any from it. She will be 87 years old in December, she suffers from Vascular disease, Obesity, Severe Arthritis and has been completely bedridden the complete time of her residency there and slowing declining since her admission. What I would like to ask is should we consider putting Mom into a Hospice situation that will only keep her as comfortable as possible until she passes? The problem we are struggling with on this issue is no one can tell us how long she is expected to live and suffer with this disease so how can we consider Hospice? Please help with some expert advice!