Even if you can't use her (though she's really the most awesome burglar evah!), she's worth grabbing for her special banana-slide move.
If you DO consider using her in your setup, then also consider giving her a full set of event jewelry. Seriously, it instantly raises her beyond Rainbow overpoweredness. Hypericum + full set of Event Jewelry > Anemone with only a single jewelry slot.
Simple reason: her counter attack benefits from the Defense stat. And there's a LOT of defense stat on a full set of event jewelry.