She would definitely be up for a trip to the falls! She just has to be talked into it (there's a beast that's hurting people and she can calm and put beasts to sleep and-- well! she's not exactly good at thinking of her own safety) because she wants to help people.

I think Nabooru might be the one to get her out of the line of fire, so to speak, so if Castle is around during the attack at all, she'd be would be much more willing to go after that.