if she would feel better doing it on her own, it is doable. If she arrives from Intl flight with a connection, she will likely actually clear at E concourse. It is also likely that she can get a seat in the train at E concourse, and certainly at F. Seats are at each end of the car. She would get off at the T concourse stop, turn left out of the train car and go up the escalators to T concourse. go up the 2 levels and you are at the middle of the concourse.

How you would then catch a cart, I am unsure. Maybe others have experience with that..