I think she would be one of the strongest candidates the Dems could put up. While it wouldn't be inaccurate to call her an establishment player, she has a progressive enough record to bring most of the Berners on board, and also has a great personality. It not would surprise me if the race comes down to her against Booker--in which case, I really hope she'd win.
This is a hypothetical about 2016 though, so in this hypothetical she would have run against Sanders in the primary. Hence, the Sanders crowd would have found reasons to not like her.