[Elsa's surprised at the sudden outburst, but... realizes it makes sense. She knows the myth behind Orpheus, after all; the lengths he went through to dive into the underworld while still alive, trying to convince Hades to part with one of the souls down there... all out of love for Eurydice.]

It's... kind of complicated, but yes. Once before. My... my sister. [Her face twists in pain. Even if she's able to put the guilt of cursing Anna aside, nothing will ever compare to the heart-rending pain of seeing Anna frozen solid, caught in one last desperate attempt to protect Elsa...] She'd been... hurt. A curse took her. But even after death, the curse was able to be lifted, and she returned no worse for the wear.

[There's so much she's not telling him, but... she's not ready to talk about that in depth. Not yet.]