She came with an offer of anti-Clinton stuff in hopes of having sanctions lifted. Jr. was interested in having the meeting. He knew of participant Kremlin connections. Whether anything came from the meeting (the pres. says nothing did) is not so important as the fact that intent to collude was there. No doubt some ugly, corrosive collusive has taken place.
Beginning almost halfway in there are some ten Russian meddling items. Four outed here.
First charges filed in Mueller Russia probe: Report