Chloe Moretz was spotted on the set of the remake to Carrie in Toronto, Canada on July 3rd. The crew changed the name on her trailer because she had tweeted a picture of it.
I guess they don't want anyone to find her? That's my only guess as to why they changed the name on it...Unless of course they got the name wrong. That would be embarrassing for the PA whose job it was to make the name tag. Either way, I hope young Chloe is happier with the new trailer name.