I had radiation for rectal cancer and although it's slightly different, I would imagine some of the same issues also occur.
The first couple of weeks were fine. Radiation treatments are cumulative so as the weeks go on, the side effects get worse. In fact, the week after my treatments were over was my worst week.
I had some pelvic issues from the rectal radiation including swelling, welts on my labia, painful urination and I actually went into menopause.
The best thing to do is to treat each symptom as it comes up. Don't think a symptom is too little to be addressed because it may just bother her a little today but by tomorrow it may be much worse.
It's also important to do really good skin care as the skin can be burned and it that area, it's really bad.