Two potential connections for you. There's Grace Rojas, who is about Samantha's age. She's a Dunhaven native too and I could totally see them having been friends for a while!
I've also got this girl here, Violet, who is Jack's age. Jack might remember her from school as Mary Sue Poots -- an orphanage kid and totally angry. She disappeared for a long time (military school prob, lol?!) and then she ended up back in Dunhaven working at the local Farmer's Market and flower farm. She's going by Violet now.