Oh I don't think there is ever a "good" time for a T to have to cancel. Please remember that they have family emergencies, and also they are caring for other patients and might be having to deal with another's crisis.(Sometimes these are in the middle of the night, and they don't get enough sleep to think!) I know it doesn't put your therapy any farther along, and the feeling is like being abandoned, but it's good to know that when and if you need your T to stop everything for you, she will!