I'm mad at me for getting her into trouble
How did you get her into trouble?
She was late for work today because I walked with her to the bus station.
Why would walking her to work make her late? If you were trying to keep her safe then it's okay.
Nothing was okay. It was the worst thing I could have done. She lost her job and she has trouble making rent on time.
But that's because didn't leave on time, not because you walked her to work. Rather than blaming yourself, you could help her see how her lack of organization led to job loss and inability to pay rent.