That's a name I haven't heard in a long time. Syrup used to be so popular back during Brawl... What happened?
Overshadowed by more characters that came into visibility between then and now I'd say. Nothing works against her outright and she could be played up into a very unique means of representing the other side of Wario games in Smash, but with only one (nonplayable) appearance since Brawl in a game that was kinda just there during the Wii generation (Wario Land: Shake It), the impact wasn't there.