She is giving me mixed signals?

Hi im in middle school and I really like this girl that ive known for a while and idk if she likes me bcuz sometimes she never talks 2 me and dosent even look at me but other times she just randomly sits beside me and makes an excuse that she cant see the board when she is already done her work both of these have happened today and her bestfriends flirt with me all the time even though I dont flirt back so she flirts with my close friends and its getting really annoying so how do I show her that I dont like her friends and I like her without saying it

Do special things for her you don't do for the other girls like help her with a problem she has or compliment her to a greater extent than the others.(cause everyone likes a compliment). For example you can tell all the girls they are pretty but tell her she is beautiful.

Try paying a lot of attention to her,help her if you see she's having a problem. If her friend goes near you walk away and go to her. You can compleat her and give her little gifts. Hope it works out for you. Good luck