Balfour Paul seems unsure about this one
http://www.archive.org/stream/scotspeeragefoun08paul#page/434/
If it's correct, then there were two sisters called Elizabeth (neither of them married to Adam Nesbit)
But his only source is Crawfurd's Peerage, suggesting that there are no primary records to rule out the possibility of confusion with the later marriage.
Janet Hay doesn't seem to belong here. Marlyn Lewis makes the the daughter of a different John Hay.
Adam Nesbit is on Stirnet, marrying an Elizabeth Hay of unknown parentage.