[rxsid]

"How can someone born a subject to the crown of her majesty the Queen of England be considered a Natural Born Citizen of the United States and thus eligible to be the Commander in Chief of the armed forces (to say the least)?"

Because there is a long line of legal reasoning that says "natural born" means born in the USA, regardless of parentage.

"“It is an established maxim that birth is a criterion of allegiance. Birth however derives its force sometimes from place and sometimes from parentage, but in general place is the most certain criterion; it is what applies in the United States; it will therefore be unnecessary to investigate any other.”

James Madison, The Founders’ Constitution Volume 2, Article 1, Section 2, Clause 2, Document 6 (1789)

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Where in there does it state a "Natural Born Citizen" of the United States can also be born a British subject?

[Mr Rogers]

It states that in the United States, it is birth place that applies to citizenship:

“...but in general place is the most certain criterion; it is what applies in the United States; it will therefore be unnecessary to investigate any other.”