To tell you the truth, I would make the trip/ This seems to be something that really makes a difference to her, and she's so against seeing a local doctor, it could become the issue instead of the real problem, not to mention that in the meanwhile this has become a sort of a contest between you two, seeing who blinks first. So blink...

Once there you can explain to the doctor of her choice that it is very difficult for you to make the trip twice a month, and can he recommend someone closer to home, or a treatment that can be followed by phone.