I won't give an spoilers, but I just saw the premiere at the Paris film festival (director and cast did a Q&A as well) and
1. that girl is just as creepy in real life
2. the director wasn't trying to make a horror film (and it shows!). She said she "only noticed it was scary after the fact." Whatever.
Pretty disappointing film and not at all the in the same family as recent French horror like "A l'interieur" or "Frontières" etc. This is a Franco-Irish/Euro co-production starring a Dutch actress (the shrink, not the creepy girl, they found her in Dublin).
One last thing--during the Q&A, a guy asked about influences (he mentioned Carpenter, for example) and the director wouldn't even admit to having seen many of the films mentioned. Contrast that with the Paris premiere of "A l'interieur" (Inside) last year, where the directors/writers were true fans of horror and were more than pleased to talk about their influences.