Is it worth it?

Yea its best if Ты end the friendship with her. If she was really a friend, she would actually be there for Ты and stuff. its not great to Друзья with a back stabber

If she never acts like a friend to you, then it's probably a sign that she's gone off, and is making new friends, so maybe Ты should do the same. I don't know what it's like for you, but i had a similar situation. I had a friend who ignored me the whole time, and i found out that she'd joined up with this new group, and had been laughing behind my back the whole time. All i had to do was chat to some of my other Друзья to see that the way she'd been treating me didn't even compare. This might not be your case, but maybe if Ты make new Друзья then she'll realize that she can't take Ты for granted, and then maybe you'll be able to keep her as a friend, but you'll have new Друзья too!

maybe Ты should just find еще friends, Ты dont have to dwell on the one

yes because it is better then knowing that your friend ignores Ты find еще friends

Try to talk to her... maybe she doesn't think about what she does? And anyway Ты can make new Друзья ;) so perhaps Ты two should take a "break" and hang out with others?

yes if i was Ты i would find other Друзья obvisly she dosent care aboutr Ты so dont waste your time with her lifes to short for haters

Maybe she´s with problems at home?