Checked on Resvin first. This is what I found:
As suspected, fixing the previous bug is what caused this issue. I've just corrected for the new bug, and it is for sure fixed in the next version. The good news is that you won't accidentally skip over sections of her quest line. The bad news is that you still need to ditch her after the first time having sex in order to make the quest advance properly.
If you're wondering how the heck this could happen when I should have been able to test for it by simply selecting the bugged choice and seeing that it still didn't work... well, I won't get into the full details because it's kind of exhaustive to try and explain. But I implemented a fix for the bug, tested that, and it seems to resolve the issue and return her to normal as well as allowing me to pick any choices without causing issues. So I thought it was fine. Apparently though this created a NEW issue where the game doesn't advance her level at all during the 'first time' version of the scene unless you pick specific choices that -weren't- altered during the previous bug fix.
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Secondly,
NoneTooFrond , "can't even start the fight" sounds concerning because there is no limit I placed on that. You should be able to challenge her no matter what. Sounds like you are missing the duel against the Prince in order to raise your physical EXP by one more point. There will be more 'easy' fights added to later versions so you can increase it without having to do three mandatory fights, but we aren't there yet. Anyway, I wanted to investigate this as well because I need to see if there's a reason why the battle wouldn't start.
Here's what I found:
I don't see anything in the code that should prevent any player in any game state from selecting the 'Battle' choice. I'm wondering if you're maybe speaking metaphorically when you say you can't even start the fight. Like, you are starting the battle and then losing very quickly?
Just to double check, I also viewed the battle script for any irregularity and didn't find anything.
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