H.W.
She blocked you on Facebook because you didn't see her as much as she wanted?
Oh, dear-- is she very young? That sounds incredibly immature.
Let her flap in the wind for a bit. Seriously. Let her reach out when she's done having a hissy fit. I know people like this and I simply will not accept their guilt. They are all thunder and no action-- they can talk about how unfair it is-- whatever. Roads go both ways. Is she *incapable* of visiting you? Would she have been incapable of coming to where you were for a visit?
Like I said, if it were me, I'd give her time to get over herself and let her reach out first when she's done trying to punish you. I don't deal with immature 12 year olds-- which is what she's behaving like. Good grief.