If you’ve sent her hazaar messages like that…then it could be, as several of us have suggested, that she was miffed about something prior to your message…and took out her frustrations on you. Maybe she was stressed already and had many things to do…and when you told her to pick her up earlier…she thought “Oh great, another thing to do, can’t catch a break” and became snippy with you. I’m not trying to defend her, just putting forth a possibility.
But after trying to talk to her…if you feel that she was harsh/unfair…then maintain a distance from her. Even more so…if you’ve always had this problem with her.