Cass

Cause he has been and is still is a terrible father to her. And, just saying he never apologized.

You're right. I said it out of frustration because the MC is getting stupid and blind by wanting to escape

She's in flight mode right now. People don't make the most rational choices in a panic.

As a fan of the dad. I feel the need to defend him lol.
A bit of spoiler.
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The father is trying to apologize in grand and has been working planning it for months. He's thinking of making the apology a grand event. That's why he doesn't want to call off her coming of age ceremony/debut/party. It's a ginormous event planned months prior with all the things present Penelope and original Penelope asked him and told him or he heard she liked. It was a mean as an apology to Penelope and prove he truly see her as his daughter and prove to all the noble and mansion staff that she is a princess and all in an Eckart. Cut the guy some slack... He's trying his best. If the ceremony doesn't happen he cannot prove to Penelope he loves her and is sorry. The coming of age will also kill the rumors of her being fake, being kicked out when Yvonne' authenticity is verified,... Without knowing Penelope dyng in her coming of age ceremony, objectively speaking having the coming of age ceremony is the best option both for Penelope's future and status among nobles. Penelope told him to not have the coming of age only bc of Yvonne's return. With only that argument that it resolved by the coming of age ceremony being grand etc. In his eyes and objectivelg speaking there is no other issue. The only truly messed up people in this story are Derick, Yvonne, Eclis