friends are hard

I have a friend atm and she is my best friend at school. we are in a group of 5 to 7 other people and she is better friends with all of them than i am. the thing i struggle with is that she will act best friends with them but not with me, when we were originally really close. i feel like im putting all my effort into being as nice as possible to her reassuring her when we have tests and complimenting her and trying to comfort her when shes angry or sad, but i dont feel like i get anything back. for example, i texted her that my brother was slamming the door and she just replies with ‘shame’ this is just one minor thing but this happens all the time. you give good friends updates about your day but when i do all i get is a shame or she doesn’t reply. you might think shes trying to be cold but we talk all day when not at school. there are so many other things but mainly i feel like im not being treated how i treat her. i know i should just stop being friends with her but all of my friends are her friends and i dont talk to anyone else in school so id be alone. we also have the whole summer planned together. maybe i should just stick it out but i dont want to waste my time with people that make me feel bad. idk, any advice? i do have one other friend but she goes to a different school