M. H.
I understand my son had growing pains as well. It sounds like she will be a tall child. Usually, being in the 90 percentile for height is a good indicator. If not then something else may be happening.
First, try to have her excerise, this seemed to help my son, do a LOT of streching exercises like YOGA,(both my sons will be tall- my oldest is 19 and is 6ft and my son who is 9 is already 5ft tall--he does YOGA and does not complain as his brother did at his age. Both boys were told to me by the doctors would be over 6 ft tall).
What happens is the tendons stretch out and then the muscles grow (at least this is what I was told) that then causes pain and swelling. It can also help to take warm to hot baths nightly to help relieve the tension some. EPSOM SALT works too, nightly! Along with Tea Tree Oil, Rosemary, (try the new Johnson's bath in a pink bottle this has most of what is need to soothe)
It may take a few weeks to work completely but it is worth a try.
There are YOGA for kids tapes or get the Jane Fonda one, it is very slow and controlled and not as difficult as some other tapes slated for beginners--I have quite afew as I too do Yoga.
Walking as well as bike riding can help.
Try anything and everything YOU KNOW of to stretch. Denise Austin has some great ones that really help.
Add more calcium to diet( but too much can cause calcium depsoits that are painful as well), as well as fiber & limit the sugars that cause the legs to spasam. Try whole foods and start to take out so much meat or poultry, unless you get it fresh. The steriods that we use in our foods have caused problems for not only children but for ourselves. This has been linked to so much growth in children-- ie the GIANT EFFECT.
Make a food journal for the child to see what is affecting the pains both good and bad.
It may help for their children later on.
Also, yes they can get more medicines like motrin--the Asprin in motrin reduces the swelling,hence the pain goes down. BUT do not give it and try nothing else. If you exercise you will need FAR LESS medicine.
Good luck, I hope this helps you.
C.