We normally see each other 3-4 times per year, and she just was here for two weeks beginning of April. I actually wanted to sit down and talk to her about the last disappearing (which was a month or so before she came to see me), but then the time you actually see each other in a LDR is so precious that I didn't bring it up again (and was hoping she would show some initiative).
I might visit her again in two months, but am reluctant to book anything because I am not sure if I should stay in the relationship yet again. I'm feeling stupid; I'm feeling like a fool she's playing games with since she knows exactly how these actions make me feel and what I told her, but keeps doing it again.

I do have sympathy for her family situation (which was her explanation for disappearing the last two times). Her mom left her when she was a baby, and only showed up years later to request financial support from her. Her dad didn't really have time to raise her either, so she was raised by her grandmom who died some years ago. She took care of her grandfather and one of her cousins while studying and working part-time; then moved out from the house when her dad moved back in with his new girlfriend and her kids causing trouble.
Being from a rather stable family background with two siblings and my parents still being happily married, I guess I cannot fully understand how she might feel. But, rationally, I cannot grasp either why this would cause such disappearing acts. Quite the contrary, as her boyfriend, shouldn't I be the go-to-person in such situations?