really really good at something weird
She has done some very consistent and impressive things in a super strange event.
According to the points tables, her best non-steeple race is her indoor 9:15 two-mile. That's the only distance she has a score over 1200 in.
Compare that to someone like Schweizer who has four events where she has a mark of 1200 or better: 1500, 3000, 5000, 10000. You may say: "Well of course Coburn could run 3:59 or 14:40," but I dunno.
10 US titles in the steeple is worth like 3 in a real event like the 1500 or 5000.