American citizenship law of the period (1956-72) specified that, if born overseas, one American parent was sufficient to convey American citizenship -- if that parent had been a resident of the USA for at least five years after the age of 14.
Why 14? I don't know. But that was the law.
If Ozero was born outside the USA, Stanley Ann was of insufficient age (18) to convey American citizenship -- as she would've had only four years of USA residency after the age of 14.
Cruz's mother was born and raised in the USA and was 28 when he was born -- thus able to convey her American citizenship.