Plus, she can slowly start to chip away at her Aspiration, a luxury that Christine did not entirely have time for. She can practice cooking, handiness, and other skills that will be essential once (or if) she moves out. For Anna, she'll already have some practice before the skills are absolutely necessary.
We saw her cook her first meal and fix her first appliance as a young adult. When we were Getting Started with Christine National, we had to endure the fact that she had zero Skills of any type. This is where the difference between Generation 1 and Generation 2 Sims really starts to come into play.