Should I leave her?

I am with my girlfriend for 4 months now. We’re both in high school, and now are summer vacation, so we don’t see each other really much, only a few times in June. Right now, I can’t meet with her because my father has vacation now, and I wanna spend that time with him, ‘cause we don’t spend much time together. She is mad at me because of this. She acts like I’ve done a horrible thing. I think about breakup more and more.
For example, when my friend made a joke (not about her) and I laughed but she didn’t like the joke she’s mad at me. It happened multiple times. What should I do?
Should I leave her?
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