Me and my mate upset a close friend. How can we tell if she's never gonna forgive us?

Me and a close friend called emma were going clubbing in Leeds at the weekend and the plan was for us to book a hotel room and have a good time. Now a girl who is a mutual friend (although very close to me and more an aquaintance to emma) of both of us called Rachel asked me if she could tag along with us as she's really like to come. Now I didn't want her to come because eventhough I love her she is really boring on a night out because she dnt drink and gets bored easily etc. But I didn't have the heart to say no so said she could come. On the day I left my phone at Emma's house accidently so only Emma had a mobile and then she announced to me that she was going to ignore Rachel's calls so Rachel called and called and even drove to the hotel to try and get hold of us but we ignored it. I would not have ignored if I had had my phone but felt I couldn't go against Emma's wishes as I was staying with her. Basically like all girls we have argued every now and again over boys, bitching, immaturity etc but we've always made up. However this time is different. Normally if we argue Rachel will send a nasty text,then I will send a nasty text until eventually we make up. The point of the text is to express urself and gain an explanation but this time she has not done that. She has not messaged,called or even replied to my attempts to get in contact. It seems like she dnt even wanna hear what I have to say she just wants me out of her life. It's been three days now. What r the signs she never wants to be my friend again?