What is a female cat called?

When referring to a female cat which is pregnant or nursing, the term queen is used (probably because she's more aggressive and domineering). Otherwise, it's usually just a 'female cat'.

If the specific cat in mention is currently raising kittens or is a soon-to-be mother, the term "Queen" would be an acceptable title, but female cats that aren't nursing or pregnant are typically referred to as a "Molly," which connotes less of a motherly feel. Additionally, the lesser-known term "Dam" is reserved exclusively for rare or purebred female felines during the act of recording or maintaining ancestral records for cat breeding.

https://www.reference.com/pets-animals/female-cat-called-75558175d244e7e8#

The term molly also seems to apply to female cats according to some internet sources. The interesting thing with this one is that there's not much (no?) origin information about this term. Where it came from appears to be a mystery. It also doesn't appear in most reputable dictionaries. The term Dam is also an older term that is rarely used.

A female cat; a she-cat.

https://en.wiktionary.org/wiki/molly

A female cat is a molly. And an entire group is called a clowder. A group of kittens is called a kindle.

http://cattime.com/cat-facts/lifestyle/1233-celebrating-cats-our-favorite-feline-facts

Once a female cat reaches puberty, she becomes a queen.

http://cats.about.com/cs/pregnancybirth/a/mating_game.htm