[And so much for trying not to dump all the information on her at once. But Anna bringing that up herself-- it has to be because someone explained the details already. She certainly isn't noticeably younger or older than Elsa remembers her.]
No... it's not strange. People are apparently brought here from each others' past or future.
[For a moment she wants to tell Anna to go first. If she's, say, from before their argument, then Elsa wouldn't even have to let her know about it. But even she realises that's her need for control talking. She is going to have to reveal this much, at least.]
You had just introduced me to Prince Hans. [No, it's really the two of them arguing, but... close enough.]