[outofsalt]

You state that your wife is a British citizen. I believe the correct term is, "subject". There is a difference.
Where was your daughter born and under what passport did she travel? I concur that getting your state representatives involved with a complete paper trail. Good luck and keep us informed as to how things go.

[cab1982]

My daughter was born in the US and traveled on her US Passport, but from my understanding she may have dual citizenship?

[sinsofsolarempirefan]

The only people who are now considered British ‘subjects’ in technical terms are Irish citizens born before 1949(when Ireland became a republic), which has very little significance, other than the fact that an Irishman or Woman born before then has the right to style themselves ‘Sir’ or ‘Dame’ if they receive a UK Knighthood (e.g. Sir Terry Wogan).

Everyone else has been a citizen since 1983 when the British Nationality Act of 1981 came into force. Before then, pretty much anyone who had the Queen as the Head of State was considered a British ‘subject’ as well as a citizen of their respective country.