Honestly, if it were me, I wouldn't say anything. This is coming from a parent whose own two children were both delayed in their milestones. If I told my DCP that we had looked into it by seeing a doctor, a pediatrician and were planning to seek physical therapy, I'd be pretty upset if the DCP said anything that indicated that she thought were lying. I'm just not sure what reason the parents would have to lie? Plus, since she is only 13 months old, most doctors would be reluctant to diagnose anything and would likely wait until she is around 18 months old to start any sort of therapy (physical therapy, occupational therapy). Hopefully this little girl makes a lot of head way in the next few months. But if not, I'd suggest waiting at least a couple months before bringing it up again.