Effie is obviously hesitant to return to New Zealand, so why does she go? Have you ever felt compelled to do something you dreaded?
I think Effie still missed her home and her siblings. The appearance of Anya who looked so much like her spurred Effie to wonder what happened to her siblings.
Her hesitancy to return was understandable; but after meeting Anya her curiosity about her siblings surfaced and could not be ignored. I think she also felt a sense of responsibility.
Sometimes you have to do what you don’t want to do because it’s the right thing to do!