Yes. I have wished there was a "delete" button on the phone...

I would be so afraid that she would be angry back at me. Retaliate. Punish. Reject...
But I arrive at the next session and she just smiles and says "So, I got your messages...." and we talk about it. And it's okay. She understands why and how this happens.

She would prefer it come up in session so we work on that. Sometimes I can, sometimes I can't. Sometimes I don't feel it until after, whether because I suppress it in session or because it comes as part of the processing afterwards. I tried journalling about things like this, and it is relieving, but when I put distance between me and the anger, then I deny it and it fades away (push! shove! bury!) and doesn't get talked about. But it does get better with time, googley. Hang in there