AIO to fiance prenup 'misunderstanding?'

fiance (mid 30's F) told me (mid 30's M) her father required a prenup for his money early on when we were dating. she stated that her father insisted that she get one to protect 'his money;' I.e. the prenup would note that anything she inherited from him would be hers, not 'ours.' She went out of the way to specify that 'our money' would be 'ours.' She said that this was all her father. I said that's fine.

Some background: I grew up lower-middle class, am now upper-middle class, so I didnt come from money. I've dated people far wealthier and far poorer than myself, never really considered a prenup. She makes roughly 3x what I do. Her father/family is quite wealthy-but lacks certain morals. All his children would admit he manipulates them (his children) with money, judges people based on money, etc.

A year and half later, after we're engaged, she went to meet her fathers lawyer. He wants her to put down her and my financial information (bank account #'s etc.). The prenup ends up not just being for her fathers money but hers and my money. She tells me I need to get all my financial information together and come sign it, and then tells me what the lawyer told her. She states that she didn't know the prenup was for her money until until the lawyer explained it to her, but that she wanted a prenup and her dad told her to blame him so that if I were mad i'd be mad at him and not her. I'm over feeling deceived because it's not what we discussed beforehand. I feel like (1) she misrepresented her wanting a prenup, blaming it totally on her father when she wanted one. (2) The prenup I agreed to is quite different from what I'm now expected to sign. I told her I'm not signing anything until I've had time to think through it. I've already had to jump through many hoops to please her asshole father. Not sure if im overreacting by standing my ground because this isn't what we agreed upon, or if it's not a big deal.

Also no, im not trying to get anyone's money.