If mama should hurt someone, am I going to be the one liable for any possible damage?

You might also contact your homeowner's insurance agent about an umbrella policy. Check that it will cover you in such situations.

First of all, have your mom checked for a urinary tract infection. My mother became combative when she had one. When she smacked a few other residents in her facility, no charges were ever filed against her. The facility handled it. I think professional caregivers take the job knowing they may be working with combative patients. I’m not an attorney, but I would say someone would have to file charges against your mom for assault before anyone would be held liable.