Nellas the Elf Maiden

This isn't a Silmarillion question per se, but this would appear to be the appropriate place to ask it since the hardcore Tolkienites read/respond to the comments in this forum.

In the Narn I Hin Hurin, Nellas is the elf maiden who wins Turin Thingol's pardon by telling what she saw.

I'd love to know more about this character.

Is she a Sindarin or Nandorin elf, or Silvan elf dwelling in Doriath? The reason I'm curious is because she's worlds different from the all the other elven women in the ancient tales - the latter are mostly Ladies of the Noldor, with the notable exception of Luthien (and Luthien is pretty queenly herself).

Nellas is an odd character. She's shy, and bursts out into tears, and sits in trees. She seems very young. Other elven characters don't seem young even when they are young.

Any additional information would be appreciated.