I had a hysterectomy for the same reasons 10 years ago. I was not triathlete then, but can tell you what I know. Her recovery period can depend on a number of things. If they do a vaginal hysterectomy. Her recovery will be a bit quicker. I had a hysterectomy that required an incision on my lower abdomen, so I can only speak to that.
It was incredibly painful for the first few days…the external incision site and the interior stitches. Walking was very painful. Driving was almost impossible for 5-6 Days because even pushing the gas pedal requires abdominal muscles. After the first week, healing began rapidly. Walking down hill or down steps was still painful, but otherwise things progressed well. Bike riding didn’t happen for several months because of the abdominal pull. Stabbing pains from scar tissue being stretched happened for about 8-10 months.
All that being said, it was the best thing I ever did. Well worth it. If she has a vaginal hysterectomy, it ,may be a completely different recovery.
Long term…she may find herself going into menopause a little earlier, but low dose estrogen fixes that right up with no side effects that I’ve experienced.
Kudos to you for caring enough to ask.