CE: The Hammettes in trouble

Contest entry to the Hammettes contest from ~blue-glitter-123

Sara: What happened to you? We have a concert in 30 minutes!
Lily: I saw everything becoming huge... Because I shrunk!
Melody: And I'm still shrinking! And my guitar didn't shrink with me!
Sara: Oh my, you are so big, Hannah!
Hannah: I'm not the biggest...
Taylor: I am!
Sara: Goodness! How am I going to get you back to normal now?

Here, the Hammettes are changing their sizes, but Sara didn't.