Yeah, Echo has friends (Priya and Tony--I really loved the little glimpses of friendship between her and Priya in this episode), plus people who understand her in weird ways (Alpha, clearly, among others). Who abandons her? No one, except for the betrayal by Boyd (which is significant, but only one person, not three million like poor Buffy).

She has no idea what it's like to be alone the way Buffy is. *huggles Buffy*