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Hi there. I would first talk to others and see if they are getting the cold shoulder as well. If they are then I would ask the principal for a meeting with all involved parties. If not then ask the principal for a meeting with you. Talk to her about how well you worked together before and that you hope to be able to work together again this year but you feel some coldness from here, is there a problem?.... If you don't go to her then the problem will never go away. Maybe she doesn't even realize how she is presenting herself or that her feelings were hurt and she is upset because no one is "reading her mind" and has adressed the problem.
Good luck!