Let's see.....did Ball ask her if she knew any of them personally or if she had seen any of them before that day?
No, that's right, he asked her if she recognized anyone in the lineup.
Totally unrelated to the FACT that Markham, long before she ever testified to the Warren Commission, indeed picked Oswald out as the cop-killer.
Whatever confusion existed during her testimony months later... It doesn't change the FACT that she positively identified the number 2 man.