Not hairflipping, just deleting.
Thank you for the responses but honestly, posting this on any board is not the way to go. None of you know her, or the situation firsthand. Summarizing the relationship with FSIL is not easy to do and I really don't feel like doing so. I shouldn't have posted on FB, but it's whatever. Maybe she'll drop the subject now.
Thanks again for the responses.
Last edit: I am NOT apologizing for the FB post

Mom to D.A (11.09) and 3 beautiful angels (06.08, 03.11, 07.12)