Hi and welcome to BYC - glad that you have joined us. I agree with QM. You may wish to check out the "Hatch-a-long" forum and theres also a "broody hen" thread (I think). - just enter into the search box and they will pop up.
You'll find lots of info in the Learning Centre https://www.backyardchickens.com/atype/1/Learning_Center, and if you have a specific topic in mind, just type it in the search box - there's a wealth of information on past and present threads.
Do you have a rooster? If no, her eggs are infertile and will never hatch. Is she sitting on eggs in the nest box? If you could post a photo we could determine what she is up too.