My children are describing a film that was around in 2013. It's a bit like coralline apparently. Animated. I'm dictating as described 
The girl in it is about 10 yo and has short purple hair. Her dad is a funeral director. There are 3 girls who bully her. She lives in an old creepy house (of course). She goes to a theme park and goes into a house of mirrors and runs off after the mean girls chase her. There's a storm and a tree gets struck by lightning and it falls on her. She's unconscious and the rest of the film is about her dream. In her dream she wakes in a coffin and meets a mummified girl who says the girl is a zombie. She meets s pumpkin boy who tries to set them on fire and he steals her skull amulet from her belt.
Any ideas? I'm clueless!