It's no wonder you wanted to be left alone. [There's no way Elsa reached this age without an accident or two. She'd almost certainly have destroyed property by now, and probably hurt if not outright killed someone. Of course she worries about accidents.]

My magic is very different from yours, but I have a few ideas if you're willing to try them. [There's no way of knowing how different their magics are, not without more experience of Elsa's power. She helped train Tris, of course, but Rosethorn has never even heard of the country Elsa said she was queen of, and there are enough strange things here... First off is seeing whether her wards will even hold Elsa's power. The room will have to be warded if she's going to encourage the girl to do anything over the course of however long they spend here. No one wants her power freezing half the ship.]