I think you are worrying about something small right now. In the grand scheme of things she's already done a lot worse... she's moved out, possible EA, etc etc. A FB thing isn't really a big deal, especially since it was a month ago.
Heck, when my W moved out, she changed her's to her maiden name, deleted everyone in my family from her friends list, and she moved every picture that had me in it to a hidden folder. I was totally scrubbed from her page.
Her FB change was a month ago... it's old news and not necessarily indicative of how she feels now.
Me: 43 W: 37 Together: 18 M: 15 D: 8 yrs old ILYBNILWY: March 2011 She Filed for D: August 2011 She moved out: Sept 1, 2011 Reconciled: May 2012 Divorce Case dropped: July 2012