I agree wholeheartedly with everything Kathy said. Keep in mind, also, that she's only been here four days. I was a wreck for the first few days my husband was in flight school, too. Then I got used to his schedule, created one of my own, and started keeping myself busy. The "problem" pretty much disappeared. It's all about compromise - however small that compromise may be. Like airgreg said, I'm sure you can give her fifteen minutes of your time once you get home and then start studying. A little can go a long way.
Try to be a little more understanding with her, and maybe she'll try to be a little more understanding with you. There are those who could never had gotten their wings without their spouses/SOs being there, and then there are those who could never had gotten their wings with them around (I read that on this site somewhere).
Even after you've gotten your wings, you'll still have to juggle more than one responsibility. You won't just be flying -- you'll maybe be division officers, and have other collateral/extra duties around the squadron. I'm not trying to tell you I know better than you guys, this is coming straight from my husband who's been in for seven years, and is reading over my shoulder. Unless you want to be single your entire life and for your entire career, you're going to have to learn to juggle a spouse, a family, AND those "coveted wings of gold." I'm sorry, but a girlfriend or wife will not single-handedly cost you your wings. Responsibility is a two-way street.
In the end, of course, it's your choice. A lot of people think it's like the old saying: "If the military wanted you to have a wife (or in this case, a girlfriend), they would have issued you one." I, for one, really feel for your girlfriend. Put her in touch with the Private Spouses' Corner -- heck, even tell her to PM some of us. We'll help her through it; after all, most of us have been there.