She might have to wait till Jan 1 to add Part B, but have her call right away.

Explore her Medigap options at Medicare.gov but do so right away since I just received a postcard stating Dec 7 is the last day for open enrollment.

Medicaid rules vary by state for SSDI beneficiaries. Income and asset rules are some times excluded for this one group. Research "medically needy" Medicaid in your state!

Obviously she'll want a doc with significant RSD experience. Mine is listed by Medicare as a Primary Care, by WC as a Primary Treating, but much of his practice is dedicated to severe chronic pain patients. He has around 6-10 RSD patients at any given time, and he's treated over 100 during his career, but he does not have a pain clinic--a good thing IMO. Everyone has their own preferences.

Being dropped by your doc has to be traumatic for an RSD patient. With the kind of meds we're on, switching docs and even pharmacies, can present major challenges. My doc has made a long term commitment to my care, that I truly appreciate.