Mother has been bedridden for 5 mos and has been in a hospital bed the entire time. She does not reposition herself, so I have foam wedges I use from time to time to keep her off her backside. The sores are primarily on her buttocks. The hospice nurse is aware, but so far have taken no action to help.
She also told me to buy a specific pillow for my mom when she sat for long periods in her recliner.
Best wishes to you and your mom.
I am surprised this has not been done as a preventative measure.
Ask for a wound care specialist to come out to evaluate the bedsores she has and get a treatment plan started.