I am a British female, born in Wales 1960, now a US citizen 1999, my daughter was born in 1995 in the US. Does she have to register as a British citizen to get a passport or can she just apply? I never registered her as a child but I believe she is British by descent through me. I went to do gov website and they say she probably is but I am not sure where to go next to make sure or just try and apply for a British passport
While there could be edge cases, you daughter is a UK citizen by descent. You can check here: https://www.gov.uk/check-british-citizen.
The edge cases would include your daughter not being your biological daughter (e.g., if you are transgender or a lesbian) or you being a UK citizen by descent (e.g., if you father was a diplomat working for a non-UK country).