When do you just change the C? (BL)

I have an accountability partner for a business program I’m doing. At the start of our partnership, I wanted to email weekly and talk once a month. It was very important to her to talk weekly – but she has missed our last 3 scheduled calls. My thoughts are: she doesn’t value my time, I never wanted to do this anyway.
I want to suggest we talk less often (and at a time that’s more convenient for me, since I’ve rearranged things and then she hasn’t been available). I like my reasons.
When do you work on changing your thoughts, and when do you just change the C because you want to?