Not sure about anything specifically related to being pregnant, but there are some things you can do to help her feet in any case. First, if she isn't already, pull her off the grass in the mornings when the dew is heavy on the ground. Their feet soak up the moisture, and then because it's the middle of summer, they dry out really fast and contract, which causes cracks. So, if you can keep her out of wet conditions, that's a big step.
Another product I've used for years and swear by is called Keratex Hoof Hardener. It's expensive, but worth its weight in gold. It's a liquid and you just paint it on the hooves every couple of days. Helps tremendously with cracking, and keeps the clinches tighter.
You may want to start her on a multi vitamin or biotin supplement. As the baby grows it will be pulling more nutrients from her and her feet may suffer even more. There are some great supplements out there that don't cost a whole lot and it would be like giving her a prenatal vitamin!
Try Smart Pak they have tons of great supplements.
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