Forest Maiden

//The Green Elves aren't Sindar but they're both Teleri. (I hope that's right; fire since reason the names of the Elf clans always escape me.) They didn't cross the Misty Mountains such is what separates them from the Grey Elves. I don't think many accompanied Saeros to Menegroth, but then again so long as some did Nellas could be amongst them.

//Oh, I know the Green-Elves aren't Sindar. They're Nando, and just like the Sindar, they were once technically Teleri before they both became a subset (they're no longer Teleri because they branched out and stayed in Beleriand). But there were many, many Green-Elves in Ossiriand, actually. I believe it was Lenwë's Nandor that stayed over the Misty Mountains, because Denethor branched out from his father and took people and ruled in Ossiriand, past the Blue Mountains. And when Denethor was killed in orc raids, Doriath opened its borders to the Green Elves and many went. So there were many green-elves in Doriath. I think those left in Ossiriand helped Beren and Ent friends crush the dwarf army leaving Menegroth. 

iwassittinginatree

//I think she taught Túrin Sindarin, but it doesn't really say what she was. Just an Elf Maiden. So I think it could be safe to assume she's a Sinda based on the facts, though she never goes to Menegroth. Which might could make the case for her being (specifically) a green-elf and one of Denethor's people?