my older sis makes me uncomfortable

So basically I 12 Female has a older sister 21 f so basically my family went on a trip to California so we can have a fun time there and it was my older sisters bday she turned 21 and after that her drinking problem got worse I mean way worse we dropped her off with my aunts at a bar at 10 in the afternoon and they got home at 2 am I was sleeping in the living room and they came home screaming crying ect so I woke up and tried my best not to cry (I hate screaming) and no one would tell me what was going on until 2 days later we went to the mall and got makeup ect and when my mom was in a store while we where sitting outside my older sis had a small pink thing and so I asked her what it was she said that it was a vape and tired me to hit it and I said no because I am a child that makes me very uncomfortable and after that she bought me something and kept touching me like hugging me kissing me telling how much she loves me and stuff I mean yeah it was nice but she was acting very weird about it so I ovoid her until we got on our flight back home my mother said that I shouldn't hang around her and that I might be like her when I grow up so after we got home she was kicked out and told to never come back