YOU SAID:

my cat looks like a black bun when she sleeps and curls herself into a ball

INTO JAPANESE

私の猫は寝てボールに丸まるとブラックバンのように見えます

BACK INTO ENGLISH

My cat looks like a black bun when sleeping and curling up on a ball

INTO JAPANESE

寝てボールを丸めると、猫はブラックバンのように見えます

BACK INTO ENGLISH

When you sleep and roll the ball, the cat looks like a black bun

INTO JAPANESE

寝てボールを転がすと、猫はブラックバンのように見えます

BACK INTO ENGLISH

When you sleep and roll the ball, the cat looks like a black bun