Originally Posted by xxdanioo
You shouldn't have to chase her around. You should be able to stand in the center of the pen, keeping inline with her girth, and direct her from there. You are running after her and getting ahead of her. This would confuse most other horses. If I get too far ahead of my gelding he will stop.
While I agree that you need to take care not to get in front of the horse, it is not so unusual to "move" in a circle , a much smaller circle, that corresponds to the horse's circle, maintaining an even driving pressure. If the round pen is large, you might have a real challenge driving the horse around by merely standing smack in the center. I usually walk a very small circle when round penning, in part because I can match my body movement and energy to what ever I want the horse to do. A slow walk should get a slow walk out of the horse. Speed it up and horse should , too.
Definitely lower the whip unless needed. It should be in neutral except when giving some kind of cue.
You 're not doing too badly and your mare is very sweet. There are some good points here to add to what you are learning.