Maybe you could give it time for the others to cease texting her, and then try again when you think things have completely died down.
Admittedly, I do that sort of thing myself (like what she did) and also hate it when other introverts do it to me. Grrrr. So frustrating. I can't say I really understand why I do it. If I knew how to solve it I would definitely tell you, but the only thing I can come up with is to give it some time and space. And then, because she is low-energy (introverted) you'd probably have to be the one to initiate a reconnection again with her after some time has passed.
I should probably ask, did you guys do school work together as a group?