Just a lil rant :3

So, to put it simply I have a friend that I'm starting to turn on. Luckily she doesn't have Spacehey, so I can rant. She's honestly, a lovely girl. Very smart, gives good advice, etc. Though she's widely disliked. I'm starting to see why. I can't give many exact examples of things she's done, besides a small few- only because she says them at school and I can't remember half of them. Here's one. She's in my friend's maths, talking to her. Girl: "Ugh, I haven't been able to eat properly in three weeks..." Friend: "OMG, are you okay?" Now. This wouldn't pose as a problem, as I'd always care for her in a situation like this, BUT. We get the bus together. This is how the conversation hours before went. Me: "You done anything good lately?" Girl: "Nah, but I had a whole 12 inch pizza to myself last night XD" WHAT. YOU LIE ABOUT SOMETHING AS CONCERNING AS THAT? 

Here's another example- which leads to another. I was talking to her about a score on a test we did. We're not in the same class, so she got her results first. She just passed, getting a strong score (Can't remember exactly) but here's how the conversation went. Me: "Have you got your English results yet?" Girl: "Yeah, I passed *gives number* , not many people in my class scored very high.." Me: "Oh, well I've got hopes I've done good.." Girl: "You saying my score isn't good enough!?" WHAT? What did I do? She needs to calm her a$$ down. The example this led onto was something another friend told me. Friend 2: "Oh, what did you get on the science test?" Girl: *Insert score* Friend 2: Oh, I got a little lower, well done though, you did good!" Girl: "I know." *smug smile.* She's being very horrible since she didn't say thanks, or console the friend about getting a score she clearly wasn't too happy about. 

For the last example, it needs some context. I'd just left a toxic relationship causing me a lot of stress and an overall difficult time. When I heard the girl got a partner (genuinely happy for her) She said something like- Girl: "Oh yeah, 'partner' did this today!" Me: Aww, fun..*A little down because of what happened to me a DAY before.* Girl: "HAHA You're single/you don't have a partner!" She's sucking the life out of me, but I'll always say this. She's amazing when she's not being horrible. She's done/does a lot for me, so I'm stuck between a rock and a hard place. 

(I don't specifically need advice, but it's appreciated!! <3)