What is this movie called?

I remembered watching a movie with a teenage girl that lives in a carinvial with her parents. But her mom falls ill and i remember the daughter writes stuff in a journal and then one day, she's in that world she creates in her journal. But someone who looks like her is in her world. So, she and this person... show more I remembered watching a movie with a teenage girl that lives in a carinvial with her parents. But her mom falls ill and i remember the daughter writes stuff in a journal and then one day, she's in that world she creates in her journal. But someone who looks like her is in her world. So, she and this person (wearing a mask) try to find a way back into her real world and her ill mother.

I don't kno what's it called. plz tell me.
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