Minnie

From Muppet Wiki

Minnie was Grover's best friend when he lived in the suburbs, as seen in When Grover Moved to Sesame Street. However, when Grover's Mommy got a new job, he had to move to Sesame Street, far away from Minnie. After Grover got settled into his new home at 123 Sesame Street, though, Minnie and her mom came to visit him. So maybe they didn't live that far away, after all.