Your GF doesn't have to love BJJ. She doesn't have to fight, and she doesn't have to watch. But if it's a serious relationship, she should have to be supportive.
If BJJ makes you happy, more disciplined, etc, she should see that and want it for you, even if it's not her thing. If she doesn't, it means she is not interested in what makes you happy - only what makes her happy. Talk with her, explain that it's your passion, and if she still says no - IMO, she is not worth it anyway. This won't be the last time you have to choose between her and happiness.
Besides, it's not like your hobby is attending porn tradeshows. BJJ will make you healthier, and you will look better. Non-fighters spend hours in regular gyms anyway, unless their GFs want to roll in the sack with the Pillsbury Dough-bag.
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