You must rescue her to advance the story.
She has information that may/will be important in future updates.
The problem is not rescuing her to advance story and such...The problem is a typical rpgm linearity - you are forced, left w/o any choice, to blindly follow "story".At this instance to interact with her, taking every forced step, or to let/watch her interact with others the same way.
That is one of major things why Im not particularly into most rpgm games, where the "story" means you have no real choices, while the gaming "freedom" is to roam freely solving "funny" puzzles and/or fight various monsters (I have all that zillion times better in proper rpgm-s aka non-porn games, so wth i would give that priority in porn-game?). ToN probably is the best example - though quite interesting story, nice chicks, no-choices means no-playing from my side.
Yet, to not go too far, we shall see how this game progresses.