To me she looks American. Strangely enough, that corresponds to Gib Melson's being American himself.
I'm in doubt in regard to the use of the genitive in the last phrase. Were it a pronoun, it would be possible to use both objective and genitive forms: his being American (formal), him being American (colloquial), right? But I'm not sure whether the following is acceptable: "... to Gib Melson being American himself." Which is correct?