Does a kitten also frown??????

This is my daughter Nuomi, she is one-half years old. I found she frowned when she looked in the mirror. What do you think she frowned for?

https://preview.redd.it/6t016xk56gke1.jpg?width=1290&format=pjpg&auto=webp&s=726a81e17bef09e7ab89c792ce63b74e41002b37