Not if the father is a foreign national. It actually depends on the residency history of the mother and the statutory requirements at that time (1970).
Again, it's all there on the State Dept.'s website:
"Birth Abroad to One Citizen and One Alien Parent in Wedlock: A child born abroad to one U.S. citizen parent and one alien parent acquires U.S. citizenship at birth under Section 301(g) INA provided the citizen parent was physically present in the U.S. for the time period required by the law applicable at the time of the child's birth. (For birth on or after November 14, 1986, a period of five years physical presence, two after the age of fourteen is required. For birth between December 24, 1952 and November 13, 1986, a period of ten years, five after the age of fourteen are required for physical presence in the U.S. to transmit U.S. citizenship to the child.
Since SAD was 27 when Maya was born in 1970, it appears Maya was eligible for U.S. citizenship at birth.
Maya was not an automatic American citizen.
But she was 99% there at birth due to having an American mother and merely had to file for naturalization at age 18 and no one gets turned down for this
If Maya had been born on US soil she would have been a US citizen at birth just like offspring of illegal aliens are (UNFORTUNATELY)