The Mom AI was an embedded program in the twin androids Dahj Asha and Soji Asha.
If either android was in grave danger, the Mom AI would activate her. (PIC: "Stardust City Rag") However, when Soji, who herself had no inkling in both cases, came close to learning her sister's fate and the truth about her real origins when she contacted her, the Mom AI would put her to sleep.
Soji's calls would never last longer than seventy seconds. (PIC: "The End is the Beginning", "The Impossible Box")
The Mom AI was played by Sumalee Montano.
IMDb listed the character as "Marisol Asha".