There's a time skip in between. The daughter goes to the academy, so yes it's pretty sure something has happened in between. It was quite abrupt atleast the time skip could have been mentioned like "Few months later" but it's not a requirement that all those data need to be portrayed so yeah that's the gap or missed chapter feeling.
And in Chapter 80, all the dethroning and everything, as the author mainly focused on the villian getting their retribution, in the background of course that would have been development between the characters. Also all the matters mentioned their can't take place over the course of just a few days, the matter that lasted for a few months or days has been summarised in a few panels in Chapter 80.
Thank you for enlightening me! It's just feel so convenient that she got pregnant and so abrupt because as you said, closing to the end of the story is mainly focused more on the issue of dethroning the emperor not their romance. Not much detail is portrayed so I guess that made me feel like that baby bump popped out of nowhere.
At first I too felt that then the whole part of Rere in the academy made me feel "Okay so there's short time gap so definitely something happened "
Did i somehow missed a chapter or something, since when did she get pregnant???