There's actually a reason why she's doing this, she can't just act out of line because 1. If she were to mess things up the game could glitch and something bad will happen or 2. Everyone finds out who she is and the game just kinds of finds out their fictional and everyone is going through ~trauma~ because of it.
I can see why she wants to carefully change her fate without breaking the game, but I don't think she needed to continue to hide behind the tree while the two had smexytime. That's just weird and awkward. And honestly, I think that's way more OOC for her to do that than to be like, "wtf you guys doing, get outta here with that". Like I said, I'll continue reading this, but that moment went a bit beyond weird.
So the art is amazing (probably 99% the reason I'm continuing this), but God DAMN the MC is a pushover. I flipped a table when she just sat behind the tree while the disgusting black haired girl did the dirty with the ML. Like, I get that she has no intention of being with him, but MULTIPLE TIMES she put it openly on the table that she would grant their wish to elope. And they still chose to cuck her. The sheer NERVE, and she's just like, "oh no what do I do, I can't make a sound, guess I just have to stay here and listen to them bang the whole time". Like WAT. She's well known for being a psycho with tons of power. As soon as she transmigrated, everyone is just openly disrespecting and cucking her everywhere, and there are zero repercussions. I get that she doesn't want to follow the same villainous path, but there's being a villainess and being a DOORMAT. Ughhh I wish she would've at least stood up and been like, "you two can do that, but get out of my area of the palace, never want to see you two again."