Tuohy workouts are very likely showing low 15s. People are amusingly having trouble imagining that she could have been tired or worn down at BU after winning a national title in the biggest event in NCAA running, even though she said she was and we see the same thing at the end of every outdoor season. But she would not have mentioned it if it was not what she was showing in training, and she mentioned it again after the race. And having the strength to run down Valby tells the same story.
The issue is indoor is very facility dependent. After she is rested up she is not going to be at BU or UW or another fast track again this season. Simpson's 15:01 was at UW and the oversized track. I can see a sub 15:10 in February. And winning the 5000m in March.