Yes. When asked the reason for her visit she said it was to visit family, friends, and do an English course. Her Facebook "private messages" showed that she was there to be an au pair, which means to do housework and child-minding in return for money.

In short, she was lying and got caught. And after all the recent brouhaha, are you surprised that the authorities had access to her "private" Facebook messages?

Added in edit, since most of the replies to this comment are saying the same thing, so I may as well reply to you all at once by adding my reply here: I put the word "private" in quotation marks. What's the odds that at least of what she posted was, in fact, public? Just how careful was she about privacy settings? Just how careful was she not to post anything at all that was publicly viewable? I'm not at all surprised that she was stopped, and given a second interview, nor that they checked social media.

I guess next time I put something in "scare quotes" I should spell out explicitly that it's a term that just might not be literally true.