The human psyche is complex, to say the least
There are two distinct, but intertwined, issues at play here I believe. Alcohol and weight loss.
Although she will never admit it, and you will find it hard to accept, your friend is jealous of your fantastic achievement in losing so much weight. Subconsciously, she will try to undermine you - by saying the things she has already said. She wants to be slim as well, and is struggling with seeing you change so much when she isn't doing so well. Be kind, be supportive, but be strong. Exante is working for you, and you want to stay with it. This is your choice.
Alcohol is the other issue. As a life long abstainer ( no moral crusading, just don't like the taste - never have, never will ), to suggest that it is not possible to have a social life without alcohol is clearly ludicrous. I manage, very succesfully!
Again, your friend is projecting her beliefs and probable insecurities on to you. What if you had given up alcohol for other reasons - Lent, being on medication for example. I wonder if her reaction would be the same? Again, be kind with her but stick to your guns. You are freely choosing not to drink. Your choice, not hers.
Whether or not you go to this event has to be up to you. I can not advise. Only you know the complete circumstances. Good luck with whatever you decide to do.
Right, enough ramblings from me!
Take good care of yourself. You are doing so well, and you are doing this for yourself - nobody else!!! Do not let anyone deter you from success.
