I want her to feel her absolute worst
Why do you want her to feel bad?
I'm so tired of her always telling me her secrets when she doesn't care about mine.
If someone trusts you enough to tell you their secrets, you should feel flattered, not angry at them. Friendships can go through phases where they feel one-sided, but that's common when someone is going through a stressful time. Be there for her and show her support and she'll be there for you.
You're wrong
Can you please explain to me how I am wrong?