Good and very easy question to answer The issue of whether she could sue IF she had not known about an alleged discrimination had been clearly ruled on years before her Supreme court case and was established law at the time of Goodyear v Ledbetter If you dont know about a discriminatory event the clock doesnt start simple as that When she FIRST sued in lower court one of her arguments for why the  day time limit should be waived was exactly that that she didnt know about the discrimination That was disproven in lower court and she dropped the allegation so the idea she did not know was never brought before the Superior Court or the Supreme Court