Or infinite reasons: - Rain distribution isn't uniform, it poured where she was and thought it was necessary. And/or - Overestimating time/sunk cost fallacy

Or infinite reasons: - Rain distribution isn't uniform, it poured where she was and thought it was necessary. And/or - Overestimating time/sunk cost fallacy ("it's just going to take 2 minutes") And/or - Giving less importance to ponctuality than others And/or - She didn't have one and thought it was a good idea, worth being late And/or ...