Pelosi's never-ending excuses

Continuing this post, Pelosi's excuse is that the House is conducting investigations into the Presidunce and we must wait to see what they uncover. She said that too about the Mueller investigation, which in itself provides ample evidence to begin an impeachment inquiry. It's just Pelosi's stalling tactic. She simply will not bring impeachment no matter what. So what's her real angle behind this?