New coworker

I have 3 new coworkers. I met 2 of them 3 weeks ago until they took my place. I met another one today. One of the new co workers. She a real bitch. She try to start with me today. She don't know me and she playing stupid games already. I put her in her place when she made a comment today. Her friend work in the same department told her don't bother me. I don't understand why recommend a friend or family to work in the same department. Her friend is another one who trying to be nosey. She try asking me what health problems do I have and what am I using to lose all the weight I have lost. I told her my weight loss is stress from this job!! I didn't tell her about my health problems. Now she going to run back and tell the supervisors. I don't give a shit anymore!!