District Judge Ken Graham, according to court minutes, gave Misty Span a deferred sentence of 10 years, at least two of which must be under the supervision of the Oklahoma Department of Corrections.
Authorities say a state Department of Human Services child welfare investigator discovered information which led them to believe Misty and Patricia Spann were actually involved in an incestuous relationship.
Misty Spann, 26, married her biological mother, who was formerly named Patricia Ann Clayton, in March 2016.
Patricia also allegedly told investigators when she reunited with her daughter "they hit it off".
She "had looked into" marrying her daughter and wrongly determined she it was allowed because her name no longer appears on Misty's birth certificate, the document added.
Her mother, Patricia Ann Spann, 44, has pleaded not guilty to incest.
This is not the first time she has married one of her children, officials said.
Patricia also was charged with incest in the case and is scheduled to appear in court in January.
Incest is a felony in Oklahoma and carries a maximum sentence of 10 years in prison.
Misty filed for the marriage to be annulled "by reason of illegality and fraud". In the complaint, Misty stated that her mother "consulted with three separate attorneys who advised there would be no problem with the marriage".
"I think she's just a sick, twisted individual that has something messed up in her head", Cody, 25, told PEOPLE last September. She forced my sister into this, there's a lot of people that now that. "Why would you want to be with one of your own kids?"
That marriage was annulled two years later by the son, on the basis that it was incestuous.
Under Oklahoma law, it's illegal to marry a close relative even if the relationship isn't sexual.
The term GSA was coined 30 years ago by American Barbara Gonyo. Was she an adult?