Psychosomatic pain?

Haven't had this exact experience, but maybe an anxiety issue? Has she been checked for a UTI or some other physical malady that may produce anxiety and/or halucinations?

Yes, though for my mother it was chest pain. The first few times were trips to the ER and all the heart attack screenings. Then follow up with her PCP many times looking for GERD and ulcers and other explanations. Never found anything wrong. When it happened after that we would give her half an aspirin and a Tums, and whether that worked or it was a placebo effect it seemed to do the trick. After a while it quit happening. Seemed to be some symptom of her wires getting so crossed during the brain atrophy. I would proceed with the ultrasound to rule out any other causes, and if it finds nothing then you may have to give a tylenol and a therapeutic fib. Yes, we will schedule a mammogram or surgery soon. The hospital is backed up a ways. Distract, rinse, repeat. The picking is common with dementia, some pick at their skin until they bleed. Psychiatric and anxiety meds can help. A geriatric psychiatrist may be the best doctor to prescribe but at minimum see what her PCP can do.