What can I do to make sure my mother is safe?

Help! My mother has had her second accident in a nursing home resulting in injury. My mother is an 80 yr old patient living in a long term care nursing home facility. She suffered a major stroke 2 years ago that left her totally unable to communicate, completely paralized on her right side, not able to get out of bed, and is beleived to have periods of dementia.
Today, is the SECOND time my mother has fallen out of the bed and had to be taken to the hospital. The last time, a CNA was fired due to the incident - and this morning the nursing home administrator gave me the same speech, "we will investigate the matter". There have been several other questionable issues, such as missing items from her room, her tray left out of her reach, other patients in her room going through her drawers (she can't move or talk to stop them), etc. I put a nanny cam in her room for a while, but the Administrator pulled it out of the room and won't permit it; even though my mother wanted it becasue she can't tell me what goes on there - but the administrator absolutely forbid it.
And now this is the SECOND time this has happened to a woman who cannot move - yet they want to tell me she pulled herself out of the bed - over top of permanent bed rails - to fall out of the bed. There is NO way this happened. She has been totally bedridden for several years - she can't move enough to do that and no longer even has the muscle strength that would require.
I am at wits end and fear for my mother's life! My wife's grand mother died from a broken neck she received when she fell out of a bed in a nursing home.
Please share any advice, experience or comments. Other than the nursing home administor, who should I contact? What can I do to make sure my mother is safe?

I am afraid for my mom!

Thnks,
Donnie