I am sorry. I was confused, and thought she said that she was not to change her plans for you, because she had another sponsee who was thinking of drinking. If she meant you as the sponsee thinking of drinking--then that does seem very cold.
Of course you are mad, and with good reason, but she is a sponsor. She is not a close friend or a trained therapist. Unless she promised to be always available, then I do know that you can fairly expect that from her. In my experience, most sponsors promise to be able to get back within 48 hours.
But I do think you can expect sensitivity and common courtesy!
So you may want to change sponsors, but I think you also have to understand that many people will disappoint you in many ways. The action you take now will set your course for the future. I think your positive actions (calling friends, investigating other sponsors, posting here, standing up for yourself when I was mistaken) bode well.
I am sorry for your loss. I also hope your sponsor situation gets better.