Or, it's a Major compliment! Mommies are supposed to get the poop away from the babies. You are so ingrained in her mind as her Mommie, she just reverts to baby behavior every now and then cause it's fun to have a Mommie!
PS: If she's soiling the same area, try 2-4 treatments using an enzymatic cleaner, and/or block her from getting into that area.