No, it’s not ridiculous.

She said she would call. She could have let you know ‘SK I can’t make it. I’ll call later’ and call until she gets holds of you... regardless of you feeling better or not.

It is being accountable and following through.

You were also in crisis or at least this arrangement was part of your (i.e. both of you => meaning she is accountable) crisis plan. You did your part and you reached out. She ought to have reached back.

As to how to respond to her... Be honest with her. Also, I would not aim for being reasonable. Instead, be authentic. If you were hurt (understandably so), tell her. You acknowledge another client was in crisis, fair enough. However, she did let you down – whether intentionally or not.

I’m sorry she let you down. I know how painful it is to reach out and be let down or to feel we are not as important as other people...

My 2c.