You need 2 Shelby points and to tell her off in the phone store, but I see a lot of people are having a hard time getting it. So I'm going to lower the points to 1 instead.I use the walkthrough mod and choose all the high-lighted green choice. I choose the option that told Shelby off in the store and I choose Shelby wear the cat costume. Still no apology scene from Shelby after the photoshot. Wonder which choice to make to show that scene.
I'll be releasing a version with vp8 30 fps videos for people having trouble. The new version of Renpy is CPU hog when videos are played.Sadly i must give up play this game, because the animations still lag. Hope the dev found a solution and good luck
Or you can try the crunched version that someone posted.