This is the part that bothers me. Never let a girl speak to you like that! You should've told her "I'm not your slave" or "hold them yourself". It sounds like she's a bit of a prima dona to me and you're wise to cut contact for a while...maybe permanently, unless she changes her attitude.
But in answer to your question, don't tell her what you plan to do. Just cut contact for a few days and if she asks just tell her you're a bit busy at the moment, then continue cutting contact.
