This is definitely her fault, she just told the prince no. Like not even a minute has passed. The prince is going to misunderstand, all that hard work she just did will be undermined by other people I mean god what did she just do that for.
But she felt betrayed too. Its not impossible to be irrational at her circumstances.
The prince promised her then suddenly he’s with Irene.
No normally I would agree with the whole ‘it was stressful she panicked and wah’ But she’s not stupid or irrational. She was the smart female lead!! I mean realistically speaking here, why? I hear you though!!
I know that high society will gossip about this or someone will use this to make a rift between crown prince & MC.
But setting those aside, I don’t think it would be her fault. Dancing the younger bro doesn’t mean she is giving him a chance. It would be unfair for them to blame MC if young bro fall in love with her.
Negative side of this high society set up is that people always has a hidden motive.