The other posters are correct in saying you can’t tell her what to do or what not to do. However, you and your other non-drinking friends are completely within your rights to not want to be responsible for her if she makes irresponsible decisions and finds herself intoxicated to any degree or in a bad situation as a result of her choices. You were fair in setting those ground rules ahead of time and while she was sober, but perhaps next time do it a little more diplomatically. My guess is that you’ll end up with different sets of friends, and there’s nothing wrong with that at all.