My mom and hallucinations.

Have you discussed this with her doctor or their nurse practioner? Put an action plan in place? Have a meeting with the administrative folks at the Rehab center to voice your concerns about care? Cause that will affect their bottom line in funding and board review of level of care and complaints they have. I'd also consult with an elder law specialist in your neck of the woods to see what your rights and your mother's rights are. You can call your state Bar Association for lawyers they list who specialize in elder law. Since this seems to be an ongoing issue, may as well get tough.

Yes just because your loved one is placed in any nursing facility you still have to be their advocate and often their voice.
Keep up the good work with your mom.

You are so right. “But you have to fight for your loved one who is in a Rehab or Nursing care center because they only have you!” My heart aches for all the people in NHs who don’t have an advocate. Your mother is lucky to have you.