It seems...She believes the path to chipping away is to continue to demonstrate that the Democrats are carefully and thoughtfully moving toward impeachment as a matter of law and constitutional duty, not for partisan reasons, while simultaneously passing legislation that most Americans view favorably, yet the Senate refuses to take up for a vote.
Right now, fewer than 13% of her caucus are active supporters of impeachment.
53% of Americans do not want impeachment proceedings -- yet. (Pay particular attention to the figures noted for independent voters in that article.) 73% of Americans want to hear Mueller testify. What do those numbers tell you? What they tell me is, the mealy mouthed Soft Middle is open to being persuaded, but they are not there at the moment.
Pelosi knows that if she moves for formal articles of impeachment too soon, Trump, McConnell, the Russians and Fox "News" will immediately brand it as a purely partisan action. With their records of past success, I can understand why she is reluctant to open that Pandora's Box. The minute she does it, she loses control over the process and the narrative.
As you can see by the little tantrum/spectacle he put on in the Rose Garden, it's driving Trump nuts. "I don't do coverups!" - says the guy who paid hush money to a porn star... lol
Trump loses credibility by the day. The Democrats' efforts to reveal the extent of his depravity, both personal and financial, are only beginning to pay off. I'm willing to give it a little time - and I say this as someone who has wanted impeachment since the day this con artist, habitual liar strolled into the Oval Office.