Agree with Sapling.
I would do it too.
I think she is obviously proud of herself to post that on facebook and so she should be, she has done good.
Perhaps a like of her status, a 'go you' type comment, then like Sap says a private message saying that you are struggling slightly and you admire her efforts. Ask how she did it. Maybe meet for a coffee and she could share her story?
For me, in the world we live in with Facebook and twitter, that is usually filled with drunken bragging, for her to post this must show her strength of character and that she really believes in what she is doing.
Good luck!
xxxx