She was spotted on the trail (by security cameras) later in the day, around 6:30 or 7 pm. Bike rush hour seems to end earlier on Fridays. I don’t usually see that many people on Friday evenings on the trails. It was also cool that evening, which means that casual cyclists and walkers probably avoided the trail that day.
I did go for a casual ride that evening but down toward Alexandria, on Potomac Ave., not on the trail.