With each word, the plates of the thing rustle a little, like leaves caught in a light breeze, and then with the full phrase--

Four of the arms slide to grip around her hand and arms, plates sliding against each other to ensure a tight fit, arms locking toher to stay on securely. The other four arms rustle gently, moving warily like those of a living thing. However it all works, there's no sign of motive power or other driving methods--it's all just moving by itself.