My 8 year old daughter is still wetting and pooping her pants

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we have been back and forth to the Dr. for years. The Urologist says her bladder contracts and that she is constipated and that is why the poop comes out in her pants at night. All of this goes on while she is sleeping. She doesn't have accidents in the day. That is why it is really scary because it has to be medical since it happens while she is asleep. The Dr. says I shouls give her Miralax(adult laxative) every day. Well, this also worries me because I read how dangerous a laxative can be especially for an 8 year old. My husband assumes that because a Dr. said it, it must be safe. I do not feel this way. Please, is there any one out there having this problem. The poop is always mushy and she says she never even feels it coming out.She does not poop on a regular basis during the day, so I have been giving her a fiber supplement to try and get her rugular. I am just very worried that she is 8 and this has been going on gor years. Any help would be greatly appreciated.