This update was as unrealistic and unreliable as it was stupid. Smart adult woman acting like a dumb bimbo horny high school girl was so quickly disarmed from her system defended by an ordinary teenager with super powers "Human Band"
Lets break it down the psychology behind the events and why she choose the actions she did.
With story as is shes implied to be under immense stress (the move into a new home, the blackmailing over her son, worried about her husband being around much younger and far more superior female specimens while at work, the kids always at one another throats the list goes on and on).
1. These things add up (stress just doesn't just happen over night)
2. While under stress everyone looks for outlets known as "escapism" (sexual, mental, physical or a combination of)
3. Stress can corrupt, make good people do horrendous or out of character actions (You give a choice between someones self or strangers survival during a stressful event think "Lost", where few reasonable selfs win out and even then there were doubts.)
4. Affection, if someone is "feeling" (mentally as in an older women whom no longer sees herself as a sex object) a longing for "it" (that sexiness that she feels has lost "it") and someone seeds and waters that longing for being looked as sexy once again (may take some coaxing and time but damn skippy they going to pounce on it.)
Just go to a bar on any giving Thursday or Friday night just before closing you see the examples of this in living color.
5.When you work a tightly confined socially rigid and doctrinated job like a teacher or cop, somethings bound to break (usually that something is those social confines of morality if not mentality first, like a teacher fucking a student or if they have a weak mental state will default to anger "going postal" as its said in popular culture).
6. Late onset sexual confusion can be brought on by stressful or past irreconcilable events that has happened in life or that have recently been triggered by consent daily stressors.