I come back at different times of the day, but everything else seems to largely be the same. What do i need to do to progress her past this point? do i follow someone elses story line for a while?

Official walkthrough https://mega.nz/file/jFRASKhC#gihGo_nGRPbTf-1sUJiNfZR6UApiuGB5OGXPvKeDeOA