So, there's Ash, of course. She came back to Dunhaven about a year after Dahlia left the military and was off doing her thing for a while before that. Given their different paths, the last several months have probably been the first time they've been in one place in a long time!
Ian will know her through Verity! I think he finds her to be good people. :)
For people around her age, I do have Alex, who would have been at the private school and graduated the same year as her. If she wants an ex from school or something like that, he's available for such things!
Nick is a few years older and went to the public school, so there's potential for having been friends back in school there, too.
And I of course have Eli and while they probably don't know each other now, I'm sure they'll discover their canon connection eventually!
Those are the ones that jump out at me automatically. :D