YOU SAID:

So my cat ate four of her kittens

INTO JAPANESE

私の猫は子猫を4匹食べてしまいました

BACK INTO ENGLISH

My cat ate four kittens.

INTO JAPANESE

私の猫は子猫を4匹食べました。

BACK INTO ENGLISH

My cat ate 4 kittens.

INTO JAPANESE

私の猫は子猫を4匹食べました。

BACK INTO ENGLISH

My cat ate 4 kittens.