Yes just played through it again, the way it should go down is;
- Day : Have the interaction where Becca asks you for the date
- Evening : go to mall, discover Becca isn't there
- Still Evening : knock on Beccas door, talk to Sara, get told she is at Priscillas
- Still Evening : go to Priscillas Stables "Find Priscilla and Becca" Scene
If you follow Sara first (to discover her pill secret), so it is night before you begin, the sequence will stall at the stables, you will need to sleep till morning before heading back to the stables to continue this chain.,