It was unexpected, Isabella also went to the parking lot to talk to Ling about something. It seemed she waiting at the main gate like mister Den and Hary. However, since they were the ones who approached him first, she didn't have a chance to talk.
Seeing him getting back to their room, Isabella realized this was a good chance to approach him. On top of that, she didn't care even though Hary saw her that way. Well, if it was other students, probably she would not go for Ling. Why? Because it can be a trigger to bully him again, knowing they were not letting her stand next to this guy.
Soon, all the students were already in their classes. Although there were some late students coming, that's fine as they went to a place where no one could easily see them. Unless students decided to roam the parking lot for no good reason.