What do you mean by "the right reaction" ? If it's when she ask you what you think about the movie, then I got it right since I get a heart after my answer ; never had a star for this. Took her 10 times to the movie, with both dresses, it never changed.
And, like I said, whatever I do with any other scenes, it don't trigger another star. I've read, read again, and again, the walkthrough, try everything for two days, it's now (in-game) day 150, I've 100 love and still stuck with 9 stars.
So, once again, how you go further than 9 stars with Ashley ?