There is a serious battle going on in the DNC at the moment. Nancy and the old guard are going to have to confront the upstarts like AOC more quickly than they imagined. I'd tend to think Nancy and the other bigwigs in the DNC treated AOC much like they did Trump in 2015 and 2016. Chuckled at his mannerisms and rhetoric behind closed doors, but got all kinds of shocked when he got elected.
I'd tend to think AOC gave them the same kind of chuckles in the beginning. She was "cute" to them when she won the primary, but now that she's become the media darling and they fawn over every word she says, they have to deal with her. Hence, the snarky comments made by Pelosi yesterday about the Green New Deal announcement. And the snarky comments made by AOC in regards to the old guard of the DNC having to "get out of the way" for the new generation.
There is a battle for the soul of the Democratic Party going on right now behind the scenes. When your "top" Presidential candidates for 2020 are already lining up behind that idiotic Green New Deal and praising it for its merits, you know there is a problem. Such a thing could rupture the entire DNC before 2020 if they don't get a handle on it.