I think she made a realistic decision given she's just a normal girl in a weird situation. She's not Exceptionally Smart or cunning but she isn't dumb at all, lmao she's just average with a dangerous (mostly for her) ability. Rodger was someone she cares about and could Possibly love, and she killed his mother. Not on purpose, but she did kill his mother.
The fire was just The crown prince flaunting his power, and it literally cost the life of someone close to her. If you think about it Roger doesn't actually have any real power. He can't do anything against The Crown Prince or the Duke (or whatever the black hair character is) if they decide to retaliate (and they did).
They can't even get married without her father's permission, and let's be so fucking fr he wasn't going to let that happen without a fight, and they probably didn't even have the time.
Rodger didn't deserve any of the heartache that was coming to him, and there was no Guarantee they were even going to be able to get married anyway. It makes complete sense why she let Rodger go, what feeling person would ruin a man's (her man's) life for something that might not even happen??
Idc this not being easy for her and her humanity makes tge story interesting in my op
I never thought common sense for a female lead would be this hard, but, oh, well, there's some people who might say, but she is not an OP female lead who are strong and independent. I'm not talking about that. I'm talking about common sense, having the common sense to make a decision based on the situation, not based on your just pure emotion, even if it might hurt that person in order to survive, you have to use the logical common sense, I guess not, this is just my opinion.