"But Cooper later admitted in questioning from Republican Rep. John Ratcliffe that she “cannot say for certain” that Ukraine’s inquiries meant they knew the aid package was being held up."
So as I said ... the emails were extremely vague and she made an assumption (like every other "witness")
https://nypost.com/2019/11/20/david-hale-and-laura-cooper-begin-trump-impeachment-testimony/