I am afraid that AFPS 75 is an old fashioned scheme which requires that children be children of a marriage which took place before leaving the Armed Forces.
If she were married, her husband could be entitled to benefits. She would have had to serve on or after 1 October 1987 to qualify. If the marriage took place after she left the Armed Forces, the pension would be based on service on and after 6 April 1978 only.