I'll tell you this- I had to do a scoliosis screening in school, and it did not bother me.
That said, if a girl is not comfortable disrobing in front of others, and having a stranger touching her body, then there is no way
the school should be able to force it upon her. How can we truly teach our girls that they are in control of their own bodies if we start doing things like this to them at such a young age?
The message this sends to a girl is that she has no control over what happens to her own body, and that is wrong.
There is no reason whatsoever that her personal physician, whom she knows and in a comfortable setting, cannot do the same exam. It would serve the same purpose- ensuring the health of the children in the school, and that is all the school should be concerned with.
This sounds like a power play to me, and, if nothing else, the one thing I would want to instill in any daughter of mine would be the idea that she has the ultimate power over herself. Period.