You've definitely hit the nail on the head, DBR. It seems she's been awaiting an excuse to blame you for everything. I've been guilty of that myself, and it's a hard habit to break.
It's even more difficult that this is all coming to a head around your birthdays, and the anniversary date of your separation. Nerves are raw on both sides. It's a good time to take a breather and clear your head for a few days. Meantime, hopefully she won't feel the need to do anything drastic and PA to "get back at you" for your regrettable mistake on Friday.
