I think the most convenient answer is

she is not a progressive. But it's also true that the Democratic establishment (which includes Howard Dean and Al Franken) is rapidly coalescing behind her -- before she has declared, before she enunciated much at all in the way of policy -- and has always taken the progressive wing of the Democratic Party for granted.

She's already in general election campaign mode IMHO (running to the center-right).

Here's two articles I read recently that support the contentions above (I think they've already both been posted on DU).

http://www.vox.com/2015/2/5/7982935/hillary-clinton-campaign-staff

http://news.yahoo.com/my-problem-with-the-clinton-death-star-220134299.html