looking at the passport application it asks if she was a British National at birth, as she was born in the US and has a US birth certificate does she have to apply for citizenship or just select yes on the passport App?

Great thanks.
In order to work in the UK will she need anything else?

My daughter was born in Seattle USA in 1993.
I married her mother in 1991.
I was born in England in 1962 to English parents.

So after a recent trip back to the UK to visit family my adult daughter (23) has decided she would like to move to England and spend time with family. I have looked at the government site for immigration and found it to be confusing. My question in simple terms is can she apply for UK citizenship ...