That movie where a girl goes into some tunnel where she meets puppet people and she finds out they want her to?

She lives in a home overrun by bugs and other stuff, and when she goes into her room, she finds a doll that looks just like her. Then she finds a small locked door, gets through and finds herself in a nice little world. (They all look like puppets) They always are nice to her, but soon they say they want to make her one of them.