That's infuriating, but thanks for flagging up the negative experience.
I've had similar from other WGs. Agree a meet, get stood up, profuse apologies and promises to make it up to me, give her another chance, then promptly get stood up again. Really makes you wonder if you have "Mug" written across your forehead, doesn't it? Although of course it can't be personal and it's just flakiness, disorganisation, and who knows what other factors.