Maggie has a heavy Scottish accent throughout the whole movie. But when she walks into the locker room where Danny spent the night, she says "You're here early" in a very American sounding accent.
Her accent is Irish. One of the defining characters of the American accent is the full pronunciation of the letter R, which English people don't do. Irish people pronounce the R as fully as Americans do, so that particular sentence with three words containing the letter could easily be mistaken.