if i were you, if you want your gf and camera to co exist at the same time, you better make her your model for the day rather than going around shooting marco shots. In this way you will not make her feel left out.
hmm.. IMHO I think you should bring your camera along,try to get her interested into photography slowly. Of course, give her all your attention during the outing and not trying to give her a mini introduction to photography. Take some couple shots on and then during the outing and let her try some shots.
After the entire outing , preview the photos that you all hve taken exspecially hers, comment on her works, (err, good comments) and hope that it does make her feel that photography is not as boring or anything that she used to think of.
If all these goes through somoothly, you two can have another hobby together, which will also strengthen the realtionship and yet spend time with each other.