Hello, thank you for taking the time to post your question!
The rate between these is that each lap is 1 mile / 6 laps = 1/6 of a mile
That means that she would need to run 5 laps to get to 5 x 1/6 = 5/6 of a mile
I hope that helps get you moving in the right direction! Feel free to reach out if you have any additional questions beyond that :)