She is almost certainly a citizen. She is not a natural born citizen and thus is ineligible. They are very different!
Yes, "citizen" can include those that gain their citizenship later in life through naturalization, as well as those that have citizenship by birth. But since Harris was born in the US she wasn't naturalized. She is a natural born citizen.
By the currently-accepted legal definition of natural-born, she is. I argued these same things with you muttonheads back in 2008, too.
Work on changing that in the future, it is beyond pointless to try this nonsense now and backdate it.