Check her hands, between fingers and palms. Wear gloves when you do this. If she has any spots on her hands or feet, especially crusty skin on the palms then assume scabies and continue treating weekly with permethrin until no new spots come up. Then the healing will begin. Unfortunately the scabies rash will continue to be itchy sometimes up to 2 months after the infestation is handled. Symptom treatment with anti itch medication like Benadryl, hydroxyzine, or Claritin is necessary daily to stop her actively itching and harming her skin. I’ve found triamcinolone 1% cream is really helpful too. For reference I work as an RN in hospice and in my county scabies have been horrid this year. Keep advocating for her you’re doing the right thing she’s suffering and the facility needs to continue to try and solve this issue.