International Cinema : Seeking Title of a Foreign Drama film (I think!!)

Seeking Title of a Foreign Drama film (I think!!)

I'm pretty sure this film is French.

It's set in a house in the woods (during the summer I think) and the main character is a teenage girl with short, shoulder length hair and wearing a blue swimsuit (Which I think she wears throughout the whole film)

She shares the house with her younger siblings and I'm not sure of what else. I seem to recall that the entire film took place in that house in the woods. I remember only seeing glimpses of it as my cable kept cutting out.

Anyone know the title and if this info is correct??
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