Yes. Definitely doable. I've changed planes in ~7 minutes when my first flight was late, and that included a terminal change and I was sitting behind the wing on the first flight.
If she's flying Delta, there's a good chance she'll change concourses.
Have her download the airline app and learn how to use it. As soon as the first plane turns off the runway, activate data and check to see what gate she needs to go to. Watch out the window to see what gate she'll be arriving at. Take note of which direction to go once she gets off the plane. Do NOT stop for anything (bathroom, food, etc). Go directly to the gate, do not pass go, do not collect $200. Once she gets to the gate, if there is time, THEN worry about food and bathroom.