Would you be hurt?

My 17 year old sister that is my bestfriend now has a friend that I think she either likes more as a sister or wishes they actually were instead of me. I try to talk to her and see how she is doing and she barley texts me back if at all and doesn't answer my calls. I asked her if she wanted to do something thus weekend and she said she was going to spend it with my mom and then posted on Snapchat that she spent the whole weekend with her friend. I was bullied really bad in school and have have not had a great upbringing and she was always my bestfriend and said I was hers. I pretty much raised her. I just feel like she has dropped me and wants nothing to do with me anymore and has replaced me. I know teenagers need and have friends like that, but she doesn't even really give me the time of day anymore. Would you be hurt too??