Not getting supervisory backup

I'm a hospice nurse and saw a 96 yr. old pt. At home for the first time since her start of care. She was A&O in the lift chair with no other family home at the time. Her daughter works at our hospital and keeps web cams in the living room and bedroom to keep an eye on her mom and things in general - good idea. The daughter called twice while I was there to review info. And the 2nd time asked me if I would take her to the bathroom before I left. Of course I said sure. The pt. Had her walker in front of her and the SOC said she uses a walker. I put the lift chair up, but pt Couldn't stand...tried a gait belt...pt Couldn't stand, however she had slid too far down to put her back into the lift chair so I lowered her to the floor, with her back against the chair, called EMS for lift assistance and sat on the floor with her waiting for them. She denied fall/injury to EMS. The grandson arrived at the same time as EMS. The daughter called while we were sitting on the floor and was notified that EMS was coming to help. We lifted her to the chair and they left. The grandson then said, "C,mon granny lets walk to the bathroom". Of course I was astounded after what we just went through but I figured I would watch how they've been doing it. She was almost a full lift for him then several minutes to go 10 ft. When the pt Said she couldn't make it. We got a w.c. Her knees buckled and she plopped into it! He said "oh it happens all the time ". I let the supervisor know. Told her I would write it as an incident and changed the care plan so that none of our staff attempts ambulation/transfer of this pt. Problem: the family is telling everyone I dropped her!! They have not made a complaint but I want the daughter, my supervisor and I to review the tape to discuss what she thinks happened....My supervisor won't. Her response is: they haven't called to complain. They never want to address issues, but prefer letting it slide. I don't care! They are accusing me of something that didn't happen. That isn't protecting me at all. Your thoughts?