My 3 year old is "fully potty trained"besides wearing a pull up at bed time but she'll stand and poop on herself...why and what should I do?

Be patient. Try to change your child's schedule so that bowel function can occur after a major meal or in the morning after breakfast. You can encourage this to occur with physical exercise for a 3 year old, then a warm breakfast, then go to potty chair! For more info go to Dear Parents: When to call the doctor for your infant or toddler---on Amazon.