"Your cat is a queen, Sam."
Translation:قِطَّتَك مَلِكة يا سام.
Any word ending in ة changes this letter to ت if a personal suffix is attached - including قطة. So your answer without ت should not have been accepted. What exactly did you write?
Note: ta (ت) and ta marbuta (ة) are not the same letters. Neither of them are added to any word - it is just that ة transforms to ت if a personal suffix is attached.