She said: "They walk past and go 'Wingardium Leviosa' for the billionth time that day, and I go aaagggghhhhhh!
"But apart from that most people are really nice about it."
Two worlds
She has two very different sides to her life - one full of movies and premieres and the other of an ordinary schoolgirl.
She said: "It's funny mixing the two worlds but I still do everything I used to do - I still play hockey and do all my sports."
And she said she's much happier with the second movie rather than the first.
"With the first one we had no idea what we were doing.
"The second time round we had experience behind us and knew the cast and crew.
"It was really good fun and everyone was a lot more comfortable with that."
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Emma talks to Lizo
Lizo reviews COS: 'Number one for kids'
