I know it sounds absolutely nuts, but . . . .
**** she wanted to divorce Kaine, but couldn’t bear the idea of leaving Kyron whom she raised for so many years..***
Good thinking - if she really resented Kyron - she could have always talked Kaine into letting Desiree have more custody time. IIRC She stepped into his life when he was only a few days old and his photos seem to show a very happy child. I think giving her bio 16 yea-old might have triggered some kind of resentment/revenge against Kaine, but why Kyron?