The words of a blue-sky beauty,
-Her eyes are blue. (Blue-sky rhymes with blue-eye)
-She is described on her profile as very beautiful.
of a moonlit lonesome belle in a house built for two:
-Belle: gender
-Lonesome: she is an outcast
-Lonesome: her companion recently died
-Lonesome: "The company of others is a thing that should rarely be accepted"
-House built for two: Reference to her bird companion.
-House built for two: Is pregnant.
-Moonlit: Her base coat color is white.
-Moonlit: Her profile picture shows her lit by the moon.
"Come to me in the nighttime and cradle my black heart,
-"May the black thing in her chest that couldn't even be considered a heart show envy"
Prove me wrong and wrench from me my gun."
-"her hatred is the bullet from the gun of beauty"
She won't be alone for much longer.
-Pregnant and due soon.
-Being stolen and brought back to a herd.