I'm off to bed, but I did a quick check, Elisabeth.
From what I can gather from the TOCs, Mercy should definitely be on the list, having posted three complete stories during 2007. Unless there's some other reason she's not, that the TOC doesn't reveal. On the face of it, she should be though.
Estefi and Choucky only posted one story each and it's still a WIP, not complete, as far as I could see, in both cases, so they won't be eligible this year. Eligibility for BNA, AFAIK, like all other categories, is based on completed stories and WIPs don't count.
But this was a fast check, so it's possible I missed something and someone could either confirm or refute the above.
LabRat