Might be a while. In the WN (which seems to be on hiatus):
He's been casting mental recovery magic secretly on her continuously in the background. Her trauma is disclosed later when he speaks with the maids at her mansion.
It has to do with another noble son, whose family was about to go bankrupt, trying to "force" a marriage for finances via you-know-what at a social event at the king's castle. She was only a child at the time.
The author hasn't updated the WN in a couple months, so I'm wondering how the heck the manga artist will proceed.