Shoshanna character development

I just finished girls and I was kind of appalled by Shosh's behavior in the last episode. I get their friend group was tumultuous but totally abandoning your friend group felt cruel. She was so bubbly and sweet in college and then I feel like her true self came out. She was a mean drunk and they say your truth comes out when you drink. Do you feel she was justified in her actions? She was left out of a lot and had a strong desire to make a name for herself.