In my view, she should be taking immediate steps to remedy this. The burden shouldn't be on you because of course you are confused and torn. Problem is that she isn't doing that and it is a holiday. A tough one.

I would write but I wouldn't apologize. I'd just say what the impact was and let the therapist take the next step. But that is what I would do with my therapist so it's not advice, just trying to feel empathy so you don't feel so alone in this.