According to Daniels calculator, her easy pace with her Marathon PR should be 6:11-6:34/mile. So it was slightly faster than that.
However, keep in mind Jordan is probably the MOST slow-twitch runner ever. Her PRs of 1500, 3k, 5k and 10k are disgustingly slow in comparison to her Marathon/HM times. No matter which calculator I use (Daniels, Tinman, etc) the times of 15:30 and 31:40 seem to be much worse than her 2:21 marathon. Hell, even Gwen Jorgensen ran faster 5k/10k but is more than 15 mins slower in the full marathon.
Being so extremely on the slow-twitch side muscle-fiber wise makes an easy run at this pace much more manageable for her than for a balanced runner. A fast-twitch runner would have to run considerably slower on her easy days in relation.