She was the Chipmunk's teacher, and the love interest of Toby Seville.
She went to school with Toby.
Primeval: New World
Alvin and the Chipmunks: The Squeakquel
She became the Chipmunk's teacher, and helped them practice for the sing-off. At the contest, she bumped into Toby, who nervously held out his hand to shake hands, but she embraced him, starting the relationship he wanted since his high school days.