This chick is a cheat, she wants you to spend unpaid time searching for an email address, and if you're unable to find it return the HIT. Basically research for free, then if one of the many needles are found in the massive haystack you get paid for that single HIT. She rejected my HIT for an email because I submitted a URL to email the professor as they did not have a direct email address on their website, go figure they're trying to avoid spammers!