Yes, she's a middle of the road Democrat. Not middle of the road overall, but definitely not one of the more liberal Dems. And you don't have to take my word for it,
here's an attempted quantifying of political leanings from 2016 that puts her closer to the true centrists than the far left.
Based on your mistaken impression of Pelosi's politics, and the fact that the four people you named as Dem leadership/voices include someone who isn't even a Democrat and a first-term Senator with no leadership position and limited previous political experience, I kind of get the feeling that your understanding of liberals/progressives/Dems comes from conservative news sources more interested in finding easy marks to stir up anger among conservatives than accurately conveying what is going on across the aisle. Is that accurate?
For what it's worth the view on the other side of the aisle is exactly the opposite of your impression of party/movement leadership. There are way more people who think Dem leadership is too centrist/passive than there are people who think leadership is too extremist.