Any help with wandering residents coming into Mom's room taking, leaving, trashing and pushing her?

I think this is fairly common. One lady at the NH where Mom is wanders. Most of the time she is dusting. She thinks its her job to keep the place clean. The NH put something like a recorder or alarm at mom's door. The alarm sounds at the nurses station whenever someone enters or leaves. The nurse or the aide is right on it when the alarm sounds. Maybe such a thing would help.

Apparently this is a fairly common situation. Many memory care residents wander, and many dementia patients have lost their sense of property ownership and their inhibitions. I think it would be extremely difficult to totally remove this problem, but I would hope that a good care facility would work toward minimizing it.

Does Mother need a memory care facility or might she do OK in assisted living or even a nursing home?

Wherever she is, don't keep valuables in her room. If something is missing, report that to the staff so they can keep an eye out for it.

What is most disturbing is the "pushing" complaint. Your mother should not be subjected to physical assault from other residents! That is the piece of this that I would make a formal complaint about.

The issue of people wandering in and out of each others' rooms and helping themselves to items is addressed in the helpful book "Creating Moments of Joy" by Jolene Brackey. Her approach might not be suitable for you, but the book does help put things in perspective.

Are these things actually happening, or are they the product of mom's imagination?

I would call the state health department, since they issue licenses, and ask how to file a formal complaint. I would also be looking for a better facility.