"Many many years ago, when she was 23, Darci married a sweet widower as handsome as can be.
This widower had a growed up son who had the hair of red, Gabby fell in love with him and soon the two were wed.
That made Gabby her daughter in law and changed her very life, her mother was her daughter because she was her step-sons wife.
To complicate the matter even though it brought her joy, Darci soon became the mother of a bouncing baby boy.
The little baby then became the brother of her step-Dad, which then made him her uncle, which made Darci very sad.
For if he was her uncle, well that also made him brother to her very own daughter in law, who of course was Gabby, her mother.
She's her own Grandma. She's her own grandma. It sound funny she knows, but it really is so, Darci's her own Grandma..."
Um... wait... no... that is not what what is going I....
She was not her own Grandma, or Mother, it was simply a Darci from the future who showed up and guided them when they saved Gabby.... at no point is it hinted that she is her own grandma. Just like it is 99% likely the stranger at the portal in the mask is the MC from future timeline.
That said, I HOPE Darci IS her own Grandma, and her Grandma is her daughter, and Gabby is our daughter, and we all have SEX.