On her WISC, her working memory was in the 34%-ile. She has an incredibly difficult time keeping numbers straight in her head while manipulating them. It seems that adding the pencil to the equation is the straw that breaks the camel's back for her.
In her case, this can partially be explained by her ADHD. I, too, worry that there is something more going on. But all of her testing failed to show any other red flags.
I wonder about dd's working memory; Is an IQ test is the only way to determine if this is a weakness for her?
What other testing did your daughter have?