Velnetskaya wanted to make the case that the Magnistky Act is not exactly a humanitarian endeavor to avenge the prison death of a blameless lawyer .. as a Russian prosecutor she was on the Bill Browder money trail and the theft and money laundering of billions of dollars from Russia - of which a significant amount ( Putin told Trump $400 million) was diverted to the Clinton campaign. That imo is the dirt she had to share on Clinton. Dirt that Putin himself raised in Helsinki with Trump.
There was nothing illegal about the meeting period.