Over the years my son has used 3mg, 2mg and 1mg dose...sometimes it just seems like we had to move up or down. He doesn't use it all all now, with a roomate and a later bedtime, and working out regularly he doesn't seem to need it.
((shrugs))
I wonder if your DD will buy the 'it's a hormone, not a drug' argument. I certainly did. I love research and all, but sometimes one has to go with what works. I don't think it's risk free 'because it's natural.' These are hard decisions.

I'd love to see your DD doing some meditation if she doesn't want to continue with the Melatonin.
Here are some resources to get started:
https://sites.google.com/site/giftedmeditation/
And meditation has research behind it, too.

Shrugs and More Shrugs,
Grinity


Coaching available, at SchoolSuccessSolutions.com