I don't think there's anything in canon about what Eärwen did during/after the Kinslaying, or whether she was with her husband (Finarfin) or her father (Olwë) at the time. Of course, she and her father are pretty much the only Teleri we have names for...
Part 246 Counting the cost
Next time: Part 247: Stormy waters
Chibis by the now-dead website formerly known as tektek.org