I think she was off-base, but I also think I'd appear to back the teacher with my silence on this one.
There are certainly times when I'm willing to side with my child over the teacher (though not to the child, of course), but I don't think that would be one. I might have lobbied the teacher for a lesser punishment, if being "written up" is a big deal. But if it's not that big a deal, I think I'd let it slide and keep my eyes peeled for other problems. One of those is an isolated incident; two is a pattern.
