It sounds like she was concerned about the Uber driver and didn’t feel like you didn’t make her feel safe. I think it’s an overreaction on her part but it’s still real feelings.
You can’t win those arguments, you just have to stay calm and say that you’re sorry for not coming down as she was arriving. Then maybe ask if the driver made her feel uncomfortable or whatever.
She doesn’t want answers, just empathy and a feeling that you care about her safety.