Chronic constipation in my almost 3 year old?

I have taken her to a Dr and prescribed Miralax. Not to get to graphic but the poop simply comes out. She has been fully potty trained for months. She is going to move up to the 3 year old class room in a few weeks and they do not allow pull ups and require the child to be fully potty trained. Is there an herbal... show more I have taken her to a Dr and prescribed Miralax. Not to get to graphic but the poop simply comes out. She has been fully potty trained for months. She is going to move up to the 3 year old class room in a few weeks and they do not allow pull ups and require the child to be fully potty trained.

Is there an herbal cure that may be better? Any other advice to keep her more regulated besides diet because that has not made a difference.
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