How severe is it? Does she take any medications for it?
My guess would be for her to talk with her doctor and see what suggestions he/her might have. She could even need to do some PT before getting to any more strenuous exercises. Usually exercises that are not weight bearing might be the best option for now until her foot get better. Lots of rest, stretching and maybe swimming might be the best options for now.
I’m sure others might have suggests more options of how to proceed with your client.