It was in that Isikoff/Newsweek piece posted here I think last week. Some participant in an e-mail exchange linked her e-mail. She was not happy with the leak, of course.
Unless Abigail Thernstrom made a public comment, I will assume she has nothing to say one way or another. Stolen e-mails published in Newsweek prove nothing...since I am not certain that 1. They were her e-mails and 2. They were unedited. In addition, private disappointment with a nominee does not necessarily tranlate into public opposition.