Rise will be doing whatever it is she can do. Partly keeping an eye on Kanji and making sure he doesn't go too far and kill anyone but since that would mean being too close to the fighting, she'd probably want to be part of the group that slipped in to rescue the captives while everyone else is fighting.

Skill-wise, she's small enough and agile enough that she's better for stealth than outright charging and she has some strength in her legs because idol = dancer. Which is why I'm inclined to put her in the part that doesn't involve as much fighting. In terms of Weapon skills she's still learning but she'll do what she can if it comes to it/if a Meister needs someone to resonate with.

ETA update: she will be partnering with Dave for this - between her Weapon ability and his Meister ability, they're quite a good team for subdual.