From what I've read about affairs, this is straight out of the WW playbook.

Re-write marital history.. in this case, it was only 4 minutes old.

It appears that if she can turn you into the villain, it relieves her guilt. So she spins up a story and gets others to buy into to it and tell her how awful you are. Problem solved, she relieves some of her guilt.

Believe nothing of what she says, just like the books advise.