She is Princeton musicology grad student Micaela Baranello. Her CV is here. (That's Bohemian soprano Mizzi Gunther, who created the title role in The Merry Widow, posing prettily.)
I guessed that she was a musicologist some time in 2011 and emailed her about it in January, 2012, noting that she simply knew a whole lot more about opera history than other opera bloggers.
And I'm looking forward to reading her dissertation!