Only because you say it's your daughter's I am going with hair clip. Typewriter keys first came to mind, but that would take some editing to look like this!
Even looking at your props and set up shot, it is still hard to imagine that this is hair grips. I have always called them "bobby pins". Don't know what we called them that.
Keep trying Boo :-)
I'm afraid some one has already guessed correct.
It was hair grips, well spotted.
glad to know what it is.
Hair grips!
Set up - http://365project.org/richardcreese/other/2013-08-28