Улетела means "flew away" or "she flew away." It's a vivid and poetic verb that suggests escape, departure, or even a dreamlike disappearance.
In the song, this word is repeated multiple times, emphasizing the feeling of someone leaving, perhaps unexpectedly or to a distant, unreachable place. It perfectly captures the bittersweet longing and the sense of loss central to the lyrics, where the subject has gone "так далеко" (so far away).
"Na Sirenevoi Lune" ("On the Lilac Moon") is a dreamy, emotional song about love, distance, and being slowly forgotten. The singer imagines a magical place, a lilac-colored moon, where his lover drifts away from him. She wants to be alone, to escape the routine of everyday life, and in that quiet space she starts to let go of their relationship. He feels that she will forget him, maybe only for a moment at first, but that moment is enough to break the connection between them.
Throughout the song, the "thin thread" and the "drop of regret" show how fragile their bond has become. He is left holding onto just a tiny piece of the past while she falls asleep by the window, flying far away in her dreams and her new life. The lilac moon is a symbol of a beautiful yet sad place where love fades gently, not with a big fight, but with soft, quiet forgetting.