If you're thinking Galadriel has grown up a lot since we last saw her; in canon Fëanor spent a Valinorean year (1449-1450) or ten solar years making the Silmarils; and this incident isn't necessarily taking place immediately afterward either.
The other Elves with her in that group are Maedhros, Fingon, Turgon and Aegnor.
Part 155: A bling thing
Next time: Part 156: Whispers
Chibis by tektek.org