Should I tell them? Or keep my mouth shut? ?

Ok so I have two best friends in the whole world. They are the nicest people I have ever met and they mean more to me than anyone. And obviously, they are like my favorite people to be around. I like doing things with them. And they like doing things with me. We are best friends. We have more fun together than we do with anyone. But the thing is, there is this girl who I hate but they are friends with. I would never invite that girl to things because I dont consider her my friend. But whenever I am around my two best friends they always try to include that girl I hate. And when she isnt included she complains and its so annoying. I know hate is a strong word.. but i really really really dont like her. shes mean and obnoxious and she is clingy and acts like my best friends are her best friends. But they arent. I go to their house or they come to my house every weekend and she has been to my house 0 times and their house 1nce. And I will be talking with my two best friends and she will just interupt and be like sooo wat are you talking about? and it is about something we are doing during the weekend so my two best friends invite her. She annoys me to death. I have told her that I have a problem with her and that they are my best friends and that we are just really good friends and thats why we do stuff together. And she always complanes in an annoying voice.. she goes up to them and is like awww u like her better or she comes up to me and says aww u like them better. I say no i like you all equally because im not an agressive person and i cant stand being mean. But sometimes I just want to say yeah I do like them better and yeah they do like me better. Or I sometimes just want to tell her to back off and stay out of my life. But I cant tell my best friends that I dont like her.. they think we are all good friends. And they dont realize that she tries to pull them away from me. I need to let them know somehow but I feel like I might be excluded that way because they will want to do things seperately. Should I tell them I dont like the other girl? Or just keep quiet and try to act like I like her and not say anything? I need help because this is effecting my life. I always try to fo things just with my best friends but she pushes in.. :( She ruines the fun times we could have had and one time I was crying for the whole weekend because on a friday we all went to a movie and she pulled my best friends away from me like she always does and made them pay all of the attention to her. She does that a lot. What do I do? :'(