Feels like my girlfriend has no interest in supporting my hobby.

I have a hobby and on multiple leages. Im always inviting her to different events im playing in, but theres always an excuse to why she can't go. In the past almost 3 years of knowing/dating she has came to less thay 5 events. This is despite her telling me she likes to watch me play. The last time it really bothered me because I was looking forward to spending some alone time together during the weekend, but the night before she backed out. I should say that she has a child, but never says/trys to ask a family member to watch them (she comes from a big family) I'm at the point of not even mentioning anything about the sport or events in the future. In my head, if she's not going to put in any effort to support me in the stuff I like, why even bring it up at all.