McMillian says she should be capable of 29:34 which seems too fast for Mary. With some 10000m training I think she could/would push the pace for around 29:50-29:58 and medal.
You don't need a sub30 to medal at the WC. And I doubt it will happen. In a non-championship race I am pretty sure she could do it. And there is hope she erases Wang Junxia's record one day.