[krnxknight]

to toss in the other op here:

she might have been genuinely worried about your safety. she knew that you had to come through some serious rush hour traffic (at least 4-6 is serious rush hour here) and when you didn't appear she became really concerned about ya. she might have had trouble expressing her relief and decided to vent it out on ya and is actually mad because she doesn't think you realized that she was really worried about you and it wasn't about having to talk to your boss.

even if the above isn't true; typically explaining the situation to someone when they're angry will do nothing (psych/bio majors can explain why if you really wanna know). apologize immediately to placate her and offer to make up for it then explain later. relationships are a compromise and if she can't accept your apology and offer to make up for it, then it's time to start thinking about your relationship.

btw, i've yet to see a female turn down a pretty flower. just don't get in the habit of buying her things to placate her when she's mad. that can get ugly and expensive.