Asalaamu Alaykum Wa Rahmatullahi Wa Baraktuh Sister,
MashaAllah it is wonderful to hear that you are practising this wonderful religion. Speaking on a personal level, It is really sad to see people close to us not wanting to make Islam a part of thier lives as we love them and want the best for them and us.
My advise to you is simillar to the other sisters. I think that you shouldn't lose all contact with them. So don't participate in the parties etc... but through your own actions and the way you present yourself you can show them the advantages of Islam. If we just left contact with anyone who was not following the path of Islam then how would we expect people to learn about Islam. It is our duty to teach people anbd show them what Islam is about, this may InshaAllah be your chance to give people dawah into Islam.