What is the best strategy as to getting any reimbursements for these expensive items?

My 96 year-old mom has Medicare A only.  Instead of Medicare B, she has a supplementary plan which reimbursed Medicare B items. Now she is in a residence with Skilled Care, and her supplementary insurance reimburses NOTHING for doctor's visits, physical therapy, etc. (what Medicare B usually does). What is the best strategy as to getting any reimbursements for these expensive items. She must pay everything out of pocket for these services. THANKS!