Mother in law has dementia and she is very violent at times. We're trying to handle things at home but it has gotten to be too much! Advice?

My mother in law suffers with dementia. She hallucinates, is violent and talks out of her head. She accuses us of taking things from her which we haven’t taken anything from her. She hides things and will just start stripping her clothes off. It is too much for us. The only facility that will take her with her Medicare has her on a waiting list. We are trying to get her on Medicaid and have a hospice nurse and doctor seeing her but there are certain guidelines so their hands are tied. We have had to call 911 on several occasions because she has just gone crazy. I know that isn’t right to say but she gets so uncontrollable. The hospital checks her out and just sends her home. I know they have certain guidelines as well but we feel someone has got to do something, it’s too much for us! We are not trained for this. We feel so bad feeling like this but we do!