So sorry for your friend's news. There should be a dedicated Nurse assigned, to give advice 24/7. Is she having daily radiation as an out-patient? If she is undergoing treatment, the radiographer will see how bad the skin is, I was given a steroid-based cream to apply when I had breast radiation. Of course the vaginal tissues are so thin that they will be affected more quickly.
Does she have a follow-up appt. with the Consultant, or mayB ring the Radiation Dept and ask for a meeting with all medics concerned.
Let us know how she gets on. No patient should be left without access to discussion with the Team looking after them.