I do rather like the concept of focusing on her personality--let her beat up the opponent, using her Special Moves to aid in the process. Neat concept! And if you're averse to PK Starstorm, you could always just have the coral shell house appear onstage. A bunch of Magypsies would come out and kiss the opponents, leaving your foes in broken-shield status.

(Totally non-canonical, I know, but it would work so well!)
And, if I may weigh in on the Rockin' / Love debate. Remember that, when naming your characters, you get to choose what your "favorite thing" is. Theoretically, you could put any number of "things" as the name of this ultimate PSI technique! Rockin' and Love are simply the default choices for the protagonists of MOTHER 2 and 3 respectively. Though the two attacks may work similarly in the context of the game(s), they could translate to Smash in entirely different ways. Just my two cents on the matter.