Were you surprised this morning to find that she had called umpteen times? What is all this telling you?
I think she is becoming more and more comfortable calling you when she is drunk. She certainly isn't hiding anything now. This is just the tip of the iceberg. I would guess she is blaming you for her getting drunk last night because you sent her the note, even if she didn't tell you that. You are always going to be the bad guy now with her.
What's your plan of action.