Curlysports, don't give up hope. We all say things in the heat of the moment, especially mothers and daughters. Let things cool down.
In the meanwhile, write a well thought letter. Tell her you love her. She told you she loved you; now that's a lot, isn't it? Forget about therapy.... do you live in the same town ? Just go and knock on her door - that's what I do if I've had a little upset with my daughter. I go to her house, put the kettle on and after an initial awkward silence, we start rattling on as if nothing ever happened.
I can't understand what you said and did, was so bad, that she decided to break away from you.
Families fall out all the time. My older son and daughter don't get on at the best of times, but I know they love each other. At the moment, there's a Cold War going on. Love +Hate = Family.
I wish you all the best !