a question for my horse-knowledgeable buddies

I rode Libby for about fifteen minutes in the round pen tonight; she did great. She's starting to understand me when I ask her to switch directions or stop.

Her biggest problem is this: She doesn't like to have her back feet picked up. When I pick one up, she pulls it away from me. She doesn't try to kick me, she just objects to my holding it. Sometimes she ends up setting it on my foot. Thank goodness I'm wearing my boots when that happens!

How should I handle this?