Friend often needs transportation to go to the doctor. Who could she contact?

She has severe migraine headaches. she lives in Archdale NC. She has to call doctor and wait for office to call her back for same day office visit. She lives alone and has to depend on someone to take her at the doctor's office convenience. Unfortunately, she has no one to be on standby for her and has to call people to get a ride. Is there a local agency that she can call for "last minute" transportation:?