350 miles per week is 50 miles per day, roughly two marathons per day. Since her marathon best is around 4 hours, and obviously she is not running this at her marathon pace, I assume she must have been training at least 10 hours every day. Bullocks! I have no data but I don't think even guys like Scott Jurek and Anton Krupica could handle such a mileage.
She said slightly under 350 miles that week. Maybe she meant to say 35 miles.
I am not judging and I am not a hater.