Girl who couldn't talk asked 'are you stupid' by grown adults Niamh Foy, 19, had selective mutism and was bullied by other children at school Updated Niamh Foy, 19, was only three years old when she experienced selective mutism as a child. (Image: Alder Hey Children's Hospital) A woman who was taunted as a child because she couldn't speak said she forgives the children that bullied her at school. Niamh Foy, 19, was diagnosed with selective mutism at Alder Hey when she was three years old. Selective mutism is a rare type of anxiety caused by problems with the amygdala in the brain.