What is an adult female cat called?

An adult female cat is correctly referred to as a "Queen." This term specifically denotes a female cat that is of breeding age, particularly one that is pregnant or nursing kittens. The use of the term "Queen" highlights the role of the female cat in reproduction and nurturing her young, which is an important aspect of cat breeding and care.

The other terms provided have distinct meanings in the feline context. A "Kitten" refers to a young cat that has not yet reached maturity. "Molly" is often used to describe a spayed female cat, while "She-cat" is a more general term that can refer to any female cat but is less commonly utilized in professional or breeding contexts. Understanding these distinctions helps in communicating effectively about feline care and breeding.