She will lose her desire for sex and for having more children. But if she makes serious mistakes during this time that will threaten her marriage. There may be no return,
___________________________________++++++++++++++++______________________________________________
Not to get all mad scientist on you.... oh what the Hell, Ma-ha-ha-HA!
Oxytocin
That is the main hormone otherwise known as the love hormone. This little chemical compound promotes child bonding, lactation, emotional affection, heightens reproduction, and social interactions (i.e. makes one more trusting and sociable). Now add that compound with
Dopamine
Now that one is the happy hormone. Makes you feel good and 'rewards' a person with greater pleasure. Things like opioids stimulate Dopamine. So with both those and a few others and you have a cocktail that affects your judgement and influences your actions. Now can a person's glands and production of these hormones get out of whack? Yah, but it's very rare; however, no one person is a like another, and the same chemicals can have a different effect on a person. So think of it as this way, while a Bee sting can kill some people, that same sting just pisses off others.
It's unlikely Anna has
Hyperpituitarism because she doesn't have the other accompanying symptoms. It's just Anna is more sensitive to normal hormones. But... that all has nothing to do with Anna's desires and fantasies. Those hormones just make whatever floats Anna's boat more fun. And more likely she will act on them to get a hormone high.
Now I hope that with this little bit of information I haven't created any super villains