I could also have written this, except my daughter (also 8) is the worst liar ever. She cannot tell a decent lie to save her life, she will make up the most ridiculous stories to cover herself! (and long may it stay that way ;))

And she wants to be an art teacher btw.

The above seems like a great solution to try. I can see it working with her. I don't think she maliciously lies, she's not that kind of kid. It's just infuriating!