Well said Eolith. Ground work is so important and too often overlooked. It will only do good for her. It makes your working relationship with your horse stronger, will improve manners and creates a very confident willing to please horse.
You could work on showmanship - stopping, setting up, pivots. Desensitizing - really endless options, I have a box of "toys" for bombproofing full of plastic sacks, balloons, pool noodles, party noise makers, a train whistle, tarps, I've even been caught leading my horse around while waving cheerleading pom poms (I am so grateful my hubby didn't have a camera!) You could play "In hand trail class" and set up ground poles, a bridge, an L to back thru, etc.
Good luck with horse and baby :)