@Barrowman: It's subtle, but I see it now. Tina is now fully dominant over Eva, but she still has not learned to dominate people her own size. With Amy, it's easy to see how this will go. Tina will become Amy's unwitting research assistant in observation of a test subject. But with Dana, there's a major conflict. Tina cares about Dana's opinion, but she has to go against what Dana would think of Eva's situation. This seems like a conflict where something's going to have to give, and the most obvious course of Tina's character arc is to dominate normal-sized people the way she dominates shrunken people, in which case Tina would become a force of nature. The hatred of bullies that was set up earlier would pay off there, and the rationalizations needed to justify kidnapping somebody will give that quite the dark twist.

As for Eva, she does still have her will. I wonder if she could fully process what it means to be helpless and bullied, while keeping that will at least somewhat intact?

@Asterisk: Don't worry, I enjoyed the beach story as a fun diversion.