I think I found what blocked me! After I repaired Elena's phone, there are two options to continue: You can go to Elena again in the evening and start a photoshoot with her, or you can wait till Thursday morning and find Kate cooking in the kitchen. As I did the phone repair on a Saturday, Thursday was a long way to go, so I caught Elena before. That's the mistake! After that Elena's story progresses further beyond a point where the cooking scene doesn't trigger anymore: dead end! It is an error in the script Morning.rpy