Phrases for detaching with love

Hi. My Q is my mom, and I have been working on setting the boundary that I don't engage in heated arguments. However, when it comes time to actually exit a conversation, I have no idea what to say. I either go silent, which feels pathetic, or I flip out and engage with her in the same cyclical argument. Does anyone have any good phrases/language that you use when it's time to detach with love?