urinary problem

my daughter is 9 but she has had foul smelling urine for almost 3 years with leaking. We took her to a specialist and they said she has daytime wetting and it could just be from constipation, so she was put on Miralax. They said this problem would go away on its own, but it has not. The smell is musty and is always present. You can smell it from several feet away.