Nope. As soon as Pelosi holds a vote, two things happen: (1) the GOP gets discovery power and full disclosure on all evidence; (2) Pelosi loses control of process and narrative.
She knows they've got NOTHING. But for now they can keep all witnesses secret and leak only the damaging portions that benefit them (like today with the NSC traitor bitch). This is all about 2020. Why would she want disclosure to expose the Democrat's (and even Obama's) dirty laundry?
The IG report is coming. Pelosi knows that this information will change the entire impeachment dynamic. The revelation that DOJ has gained possession of two of Mifsud’s phones is a shot across the bow that the IG and Durham reports are looming. Impeachment will be seen as part of an ongoing coup. Nancy is keeping her powder dry for the reasons you mention, but she is also taking the long view on what cards Trump has to play.