My little signer

Isla is doing very well with signing. She can sign 'eat', 'more', 'water', 'milk' and 'dog'. She does all of them both spontaneously and with prompting. Today, she started shaking her head 'no' when I say no. Of course, she shakes her head with much earnestness, but she does not actually stop what she is doing. Plus, she is so cute shaking her little head that I have a hard time not laughing and letting her get away with it.