User blog comment:Zippertrain85/Dawnguard Conclusion/@comment-17114085-20140511164121/@comment-9062114-20140521171247

Obviously these Snow Elves couldn't have gotton to uninhabited land. Since if they did, they probably would've started a kingdom of their own, that in it's self could show that Skyrim was completely colonized under one government of humans, which was Ysgramor's.

She says that she was a Vampire at this time, meaning she must've been the same age due to the fact Vampires never age passed the time they were turned into one. So, assuming that she's young, she was probably talking about before she got in the tomb from Valerica, her mom. Also, she talks about how she moved into the castle, not as a child though.

She was surprised that there was a new one, not that there was one in general. Since, that's a pretty important thing if a third one showed up.