Is she a bad friend?

Heyy guys

So I have a friend we call her Stacy (that’s not her name) she is so weird and like we sit at a table together with two other girls and always when we have a project she wants to do with them like their just a trio and I just hate it! They leave me out and she always brings snacks for them like how she used to do in the past with me. And last time I asked her for a pencil and she said "what you can’t buy yourself one?" Like YES I CAN🙌🏼  and omg I forgot to tell y’all her birthday day is in two days and she invited every girl in our class except me😞

So what do y’all think should I end the friendship?