She could have lied to Lynch and Fusion GPS's owner.
She could have been saying that she was meeting with DonDon in an attempt to smear soon-to-be GEOTUS, but in reality she gave them dirt/info about Fusion GPS's, Obama's, Lynch's, Clinton's, DNC's, etc actions.
The DS thought that all they needed was for her to show up, regardless of what they talked about.
Officially it would have been about the Magnitsky Act, which was Veletnitskaya's cover with Fusion GPS's owner when she met with him the day before and after the meeting.
All Trump needed was for her to show up, with Lynch's signature to get into the US, and having met with Fusion GPS's owner to cement all the relationships.
The Dems legit expect everyone to believe that all of that was coincidence.