Is she good friend or not?

My best friend and I are like the best friends ever. We know each other 100%, being together is 100%. But the thing is she never seems to care. For example, it’s always me making plans, asking how she is. And she’s cool, we hang out. But she never try’s to put any effort in our friendship or take responsibility for it. She calls me her “bestfriend” but never has she asked me how am I or plans something. I’m not asking for much except a mutual friendship. Prom is in 2 days and she’s getting ready with a girl who, and I quote, she “feels bad for”, and she left me to do it alone and as her “bestfriend” she would let me be alone. (I’m not saying it’s terrible-I’m fine w that. but the fact she chose someone she says she doesn’t even like over me gets me to question, why🤔) and since she’s doing that we planned a month ago a pre prom sleepover. And I-ME have brought it up once in a while about how I got us facial masks and crap and then today I reminded her that we’re going to see infinity war and stuff tomorrow and she said she can’t bc she just told the same girl she feels sorry for she would stay the night with her bc she’s “lonely” as if I’m not? And tbh idc what she does I just don’t like that she doesn’t think bc she does things about how I- her “bestfriend” would feel. I mean we’ve had this planned for a long time and I was super excited and she knew I was and now she’s bailing on me for her? Idk when she told me that I got upset and I told her how I felt and she just went off on me saying “it’s so hard to please you, I’m not f***int perfect” but fr the only thing I ask from her is to be a decent friend. Idk do you think I’m asking to much or to pushy? Or is she insensitive?