The section in the Iliad is about recieving a favourable wind, it was a great crime though and Artemis snatched her away at the last minute to beceom a priestess, Agamemnon was cursed anyway, so it didn't do him any extra harm.

I was thinking more in terms of Archaic rather than Mycenaean. I'm writing a bit on Lefkandi and it looks rather like the poor girl was sacrificed.