She should go to jail for violating the teacher-student power imbalance. But calling a 16 year old a minor who requires the level of "protection" of life imprisonment of a sexual partner older than a certain age is utterly absurd.
As far as the sex is concerned, the same acts with someone his own age would pass with a wrist-slap at most, and goes on by the millions every day. The predatory sex laws are massively misapplied - a sixteen year old boy is NOT in need of "sexual protection" such as, for example, a pre-pubescent child. To compare the two destroys the integrity of the law itself.
My short answer to your reply is that you are wrong all the way around.
“She should go to jail for violating the teacher-student power imbalance.”
The age of consent in Oklahoma is sixteen. Also, she is an elementary school teacher and he is in high school. So how does she have any power over him?