It's about half an hour into Fern's visit when a second elf appears, walking near-silently between the trees with a basket. Approaching a berry bush, Sina inspects each one before she plucks it and drops it in, every so often sneaking one into her mouth with a pleasant smile. These berries are important for a lot of reasons, but they're also just nice to eat.
She's moving around the side of the bush when she looks up and catches sight of Fern, at whom she gives a shy smile of greeting. The girl has no vallaslin, and city elves can be cagey about the Dalish. No need to instigate anything.