Firstly, with diabetic client I’d be very consistent about time and BS reading prior to exercise. This will help a lot to keep her positive and energized. Some do better at night.
Outdoor track allows for limitless possibilities of fun training! I’d likely approach from a cross training or HIIT standpoint. Just keep her moving for the time you have, rest is active, walking around the track.
I’d start something like 10 foundation/base exercises like squat, goodmorning, modified push up, modified pull up with band, seated press (with some weight), (multidirectional)lunges or ones she’s good at, arm running drills, dips, seated crunches and maybe a flight of steps done for 10 reps on then 30 seconds rest x 4 sets. Next, I’d walk for about 3-4 minutes after each exercise, letting her recover. Later you can turn that into other high intensity drills for cardio as she gets more fit.
Therefore you’d have 4 minutes on~ resistance, followed by 4 minutes on~ cardio, done at a 1:1 ratio.
Super creative? Perhaps not, but a great place to start with this type of client.