How did I just realize why, in My Goodbye, when Ody says, "You're alone!" It hits Athena so hard?
If you remember Athena and Pallas, the story goes that Athena was training with her friend Pallas, a nymph, and Zeus thought it was going too far, so he lowered Ageis (which he was keeping for Athena at the time), and it distracted Pallas. Athena made a jab - for lack of a better word - towards her stomach, but since Pallas was distracted, she wasn't able to dodge. Athena ended up accidentally killing Pallas.
That's why "you're alone" hits Athena so hard, because she used to have a best friend, whom she accidentally killed.