[_debug_]

OP wrote in another message that "her account got temporarily disabled within a short time of her posting that comment". Is that possible for non-Facebook employees to effect somehow? If not, then it was one of your colleagues, not a troll.

[sriramk]

I'm the OP. It could be possible that someone knew how to get into her account and had just done a self disable/enable. Far fetched though.

[HeyLaughingBoy]

Considering how dumb most people's passwords are, it's likely easier than you think.