Join Date: May 2009
Location: Winnipeg, Manitoba, Canada
Riding is almost necessary, galloping needs to be limited. If the mare is in tip-top show condition, and continues to be that way for the duration of her pregnancy, then doing her regular shows and workouts through the majority of the pregnancy likely won't be a problem. As soon as she starts showing and carrying extra weight though, you must use extreme caution. She has a lot more stress on her body, and her food needs to be going to feed two mouths, so the person should be well educated in how to keep the mare fit and in good weight if she's using her energy to work.
I personally would not continue showing or doing hard work once she begins showing without the advice of a veterinarian. It seems stupid and ridiculous to risk the pregnancy for your own personal benefit after investing so much time and money into it.
As for riding a pregnant mare, you can work them lightly right up until they give birth. As was stated, the better shape a mare is in, the easier the pregnancy should be. Healthy and well maintained mares have less complications.
I hope God tells her to smash her computer with a sledgehammer.