Both Annie and Romy would have been friendly with her, so friend lines are absolutely available there!
Stella is BFF with Ash, so she would definitely know Dahlia :3 She's always been friendly and would probably year her the same as she does her own little sister. 😊
Jun would obviously know her, too! And would probably have stayed in touch after the breakup, even if only through Facebook or the like. He had frequent teas with her mom, so there's that 😂