|Real world information|
For the most part, she looks like Mandy; however, she smiles more, has rosy cheeks, and long eyelashes.
Initially, she was the exact opposite of Mandy being, cheerful and happy, and having tea parties with her unicorns. However, she was also highly delusional, believing her unicorns to be real, and using mustard as "magic oats" for them.
When confronted with the truth, she began to crack mentally, not wishing to accept the truth that none of her friends were real. Eventually, she accepted the truth, and in doing so, became just like Mandy, so much so that even Grim could no longer tell the difference between them.