Hi maddlove,
good post

It may be worth understanding a bit why you feel this way. There seems to be a strong desire to feel responsible for what happened beyond what is rationale. Yes, there is a chain of events but not all what leads to bad outcomes is predictable, preventable. Not all that is predictable and preventable is reasonable to predict and prevent. Not all the can be predicted and prevented is worth predicting and preventing as there is an opportunity cost to spending that effort. Etc... .
There are three directions which may be worth investigating:
- anxiety: You seem to latch on to guilt. Fear can make one do that.
- childhood, patterns and roles in your family back then.
- boundaries. With a proper set of boundaries your sense for what you feel responsible and for what not will be greatly improved.
Last but not least: You handled the situation well

Validating her and calming her down. Used SET. You took the right tool, applied it in the right way at the right time. There was a drama and you were the rock on which she leaned. Celebrate it. These sort of smaller external dramas help a lot making the relationship stronger in a healthy way as they let you experience each other as true partners.
If she blames me, wouldn't she be right? Because she asked me like 4 times to go with her, but I didn't want to go, wanted to stay home and play games.
If she blames you it will be due to her emotions coming up again. Like in the immediate situation the question is not whether she is right but how to help her to calm down. You have done it before and you can do it again.