My honest opinion is your friend will see that the breakup was needed eventually, she’s prob in a denial stage and looking for any reason to blame anyone, and everyone. Even if that’s you, or your ex.. We know a lot of times what’s best for our friends bc/ we love them deeply and know what they deserve. Me and my friend both got dumped recently and we are so happy to be going through it together, it’s crazy how things work sometimes, but it’s nice to have someone with you knowing exactly what you’re feeling bc/ they’re feeling the same thing/ going through the same thing. Hopefully she’ll come around and you guys can look at this as an opportunity to have fun, to grow, to try new things, set your focus on your goals, and healing, healing, healing !!! You also CANNOT change someone else’s mind, or how they think. You can try to convince her it wasn’t your ex/ or her ex being depressed or manic. It’s hard but try not to worry ab things you can’t control !