I'm convinced that she thinks she's signed up for the list, but she's not. I've explained that she's not. I've explained why she's not. I've offered to generate a new invitation for her. I've told her to forward me the one that she has and that I will sign her up. I've given her my phone number. There's not much more I can do.
*pulls hair out*
*(Really, I can believe it. That's what's so sad.)