All day she has been avoiding the phone.
She knows she has to do the right thing. And the sooner she does it, the better. She gets it over with, and she doesn't have to worry about it anymore. But who does that in real life? Instead you procrastinate and think about it and put it off and think about it some more until that one little pebble grows into a giant block inside your head.
It's only, she reminds herself, a phone call. But she has so many other important things to do first..