Well I am not going to be much help because I would figure out a way to get milk out of her. I don't take kindly to my animals telling me no. Best of luck to you both, hope she goes soon. What day is she today?
I think she sounds very "ready". I find the shiny coat, the long vulva, and a tail with no "clamp" power, when combined, mean foaling is imminent. (And they make a fool of me repeatedly).
Hope you are right, and we get word of your foal within the next day or two.
(I'm watching 2 gals -- who still have entirely too much clamp in their tails, though one's coat condition says she is getting there.)