I had a feeling Gella was going to be told soon.
I wonder whether there is something engineered at the heart of her lack of menses. I'm trying to remember if there is any magic in this setting.
As for natural causes, stress and malnutrition can cause it, but I don't know if it can on a continuous basis. There is unfortunately a number of untreatable causes as well. I hope there is some sparkly magical cure if our girl would like to have children. Of course, given her life so far, I have a feeling children are not something she would ever consider, so such a condition might be for the best.
And in that vein, I also suspect this is some kind of plot to cause the end of the ducal line.
Considering that the maids were trying to poison her through the make-up, it’s very possible that there was some other kind of medication that the King was using to insure she couldn’t conceive.
It did seem like a really odd hole in the King’s plan to try to control the Duke’s family by having him marry his sister. The husband was a recent war hero, and even if the sister WAS crazy any child she bore could potentially be a royal heir.
And when you are a tyrannical king who established your own reign by massacring your own family (as well as one of the most prominent noble lineages), it seems dumb to risk your sister having a child with a popular war hero since both the general public and the other nobles would be more likely to back them instead of you.
But if you have the popular war hero marry your crazy sister (who you are secretly poisoning to remain barren) then it kills two birds with one stone.
You have less of a risk of the war hero having any heirs. And then by making sure that the current Duke is busy having an affair with a woman you are also controlling, it means that the chance of the Duke having another heir is also really low.
If there’s any evidence (whether real or manufactured) that the sister was mistreated at her husband’s home, then that could be used to justify punishing the entire family under the reason of disrespecting the royal family.
And failing mistreatment, the king decided to have the maids kill the sister through poisoning. That would have still given the king the excuse he needed, even if her suspicious death might have made the other nobles uneasy.