Why did you over extend yourself and put the pressure on your S4 to talk to her? Did you feel it was the right thing at the time? Or were you scare of upsetting W and her reaction if she did not get her way? It was like the change in her tone of voice scared you.
A 4 year old playing on a playground wants to talk to stop to talk on the phone for no one! Your W was being selfish and angry because she was not getting what she wanted.
Don't go out of the way for her anymore. Don't let her scare you.