I wouldn't reply back to her at this time. Her guilt is eating at her and she will do anything to have contact w/you and the girls at this time. Leave her to stew in her pot of juices for a while.
Now that the pressure is off of her, i.e., paperwork signed, she's turning her focus on trying to stay connected w/you the only way she knows how...the children. Yes, you are doing the right thing by being civil to her, but you do not need to respond to her missives unless it's important or directly related to the girls at this time. She needs to miss what she had and has now lost.
BTW, I don't think the friends told her. I think she may have visited their FB pages and found you there and clicked on the info and saw what you posted.
As for you, my friend, take care of that foot, continue moving forward and keep the focus on you and your girls.
