Just curious!

I have a buff orphington that is about 10 weeks old. I am fairly new to raising chickens and I noticed she has been opening her mouth really wide and then shaking her head a little afterwards. I don't know if this is normal or not I have not really seen it in the others.she acts completely normal and happy. She eats drinks and plays but I'm just curious if anyone has seen this before and if it means anything. Thanks!