I'm really sorry this happened to you. What kind of events do you both attend, and how often?

I've actually been in somewhat of a similar situation. I know it's difficult, but just ignore it and let it blow over, because it will. She chose to initiate contact after you simply complimented a FB photo. True, when she expressed that she wasn't interested, it should have dropped. But the bigger deal you make of it whether online or at events, the longer it will play out. I suggest not contacting her at all online and limiting contact with her at events to cordial communication.

PS If you do end up being friends again, remember that the unfriending and blocking stuff on FB isn't a form of communication; it's akin to slamming a door or punching a wall on the way out of a house.