[Perhaps it's for the best that being a wizard's phantom steed thing is kind of reason to not question how fire works on snow like that, weirder things have been seen. But she's keeping a close eye on him before casually plopping herself into the snow near Lydia, but not blocking the fire.]

Maybe an hour or something? I'm a horse, what is time. [Good point, of course. Though she's just kind of not sure what to do at this point, in theory she should be able to warm Lydia up herself. But not being a real flesh and blood horse makes that... impossible, really.]

First time she's done this, so, like, no idea what's going on here.