I hear The Sweet Escape a lot and I think out of all Gwen's songs it has the most recurrent airplay. I wouldn't call it a "classic" but it's deffo remembered.
Bonnald McDonald is kinda an ATRL staple already, no?
Not too much on her though. She wrote the anthemic Dynamite after all. She said Dr Luke told her he was going out to a party, and she had to have the hook down by the time he came back