Given the fact that her title isn't a literal construct, Elsa has no choice but to grab onto the oh shit bar instead. It's not that she's scared, but she does value her safety even if she doesn't feel in particular danger. The truth is, her heart is hammering in the best way possible and it's exciting. After a few moments, the adrenaline becomes too much and as they take a turn fairly sharply, Elsa lets out an excited "Woo!"

She feels a little silly for it, but some things just can't be helped.