Does Bruno's grandmother agree with the actions taken by her boy?

Bruno's mother does not approve of her son's work with the Nazi Party... she is ashamed.

"I wonder - is this where I went wrong with you, Ralf?' she said. “I wonder if all the performances I made you give as a boy led you to this. Dressing up like a puppet on a string ... ”Standing there in your uniform,” she continued, “as if it makes you something special. Not even caring what it means really. What it stands for.”