Just like Miguel'smom, My gf made me go by threat of breaking up. I reluctantly went and it took me a few years before I started even considering becoming complaint with my doctor's requests. To answer you question, I think it depends on the person. Some people like a little more support and interaction from a spouse and some don't. I personally prefer my gf to go with me to my appointments because it gives the doctor good insight from a 3rd party. When I get really bad and start to skip my meds my gf will step in and distribute my meds for me while watching me take them.

Personally, I think it us to your gf on how you should treat her. If she doesn't want you to be in on her doctor's appointments then there is really nothing you can do about it. She's the one that has to decide what level of help she will accept from you. I know from personal experience that when forced to do anything by the gf I push back and am not complaint because I'm resentful.