Just like learning to tie her shoes, toilet training takes lots of practice to make perfect. Explain that her body makes poop everyday which needs to go into the toilet. It's also important to keep your daughter on a regular schedule. Having her sit on the toilet shortly after a meal helps. She should also sit on the toilet before leaving the house and at bedtime.
Accidents can also occur when a child is too excited or too busy.
She may be rushing through the process to get back to playing as soon as possible. To reduce accidents, make each toilet sitting a pleasant experience. For instance, try reading her a story each time. You should also give her responsibility. Make sure that she takes an interest in staying dry.