Maybe so. She is about 24 miles down on her 55 mile per day target. She should be at 660 miles today, but is at ~636 (666 per Garmin minus the 30 miles of backtracking that started the day). She is at an RV / motel location now. There does not appear to be a reasonable stopping place for another 18 miles, and about 2 hours of sunlight/twilight left for the day. It might be best to call it a day and make a really early start tomorrow.
You can always drive back after a day of running. That is probably not the reason. I think she injured herself. Shin splints!