What is she looking to train? Ability to run the distance or ability to run the distance faster?
Jack Daniels said that specific stress leads to a specific result. If she runs all those runs at the same pace, she’ll only ever run at that pace.
She could increase the distance to prepare to run 13.1 miles by adding a km to each every couple of weeks.
Or she could keep the overall distance and add in bouts of shorter faster running, before building distance slowly on top.
I’m training for a half mara. Each week I’m doing one day of 1min reps, one day of mile tempos, one long day and fitting in whatever else I can at a steady pace. The McMillan running calculator is great for helping with working out appropriate paces for these.
Remember it’s supposed to be fun, too!