That makes no sense at all. First, explain who the woman is a pawn of? Putin? Clinton? Obama? George Soros? JR Ewing? No idea where you're willing to go with this one.
Second, even if the meeting did end after 10 minutes and Kushner and Manafort were not interested in what she had to say (and let's throw in Trump Jr. for good measure, too), and even if the woman did have no useful dirt whatsoever on Hillary (and we don't know those things yet), SO WHAT? Does that erase the email exchange Trump Jr. had with Goldstone? Does it erase the fact that he, Manafort and Kushner actually met with someone who was presented to them as a representative of the Russian government with possible dirt on Hillary?
Per my post above, do you believe the perverts who get tricked into a meeting with Chris Hansen committed no crime because there wasn't an actual child waiting for them at the address they went to?