Though he wouldn't admit it, Ander was a little taken back at the fact that she knew of Terra. However, if she had spoken to Dremmick at all, he could have told her that much. But then again, Dremmick wouldn't go blurting out things about missions, much less personal ones, to just anybody. He would have had to trust them. 

"If you know about her then you should know very well why I am doing this."