She's the headmaster or principal in charge of a private school.

1.) The homewrecker who has relations with married or attached men.
2.) A woman with power and authority, having complete control of a household, business establishment and employing help. ‘Mistress of great fortune.’ 'My mistress wouldn't be caught dead in those fugly garments!'
3.) She is skilled in an occupation or art.
4.) The master or owner of animals.
5.) British. A teacher or head school mistress.
6.) In the olden-golden days, you would address an unknown female as mistress. In the same respectable fashion one would use the term, 'miss'.

Backstreet wife, Best girl, Canary bird, Chatelaine, Comfortable impudence, Concubine, Courtesan, Demimonde, Doxy, Fun mouth bucket, Gallimaufry, Geiko, Geisha, Gigolette, Goomah, Grass widow, Grisette, Grizette, Gumare, Hen, Hogan's goat, Homewrecker, Inamorata, Kept woman, Left-handed Wife, Ligby, Light horse, Mistress, Mrs. Princum Prancum, Nobsy, Odalisque, Odalik, Paramour, Pintle bit, Poor man's Wendy, Pout, Prinkum Prankum, Rainbow, Saturday-to-Monday, Shack job, Side Chick, Side Piece,

Also known as the MC, she directs events such as television broadcasts, acting as the hostess to introduce the speakers or performers.

Duh

Ms. know it all

a woman who is preoccupied by turning herself out neatly and thus by the mind-set that is presumed to go with such obsessions.

She presides at a dinner party and introduces the after-dinner speakers or announcer.

Your husband or significant other has made an internet friend of the female persuasion. They spend a lot of time "chatting," WTFing and laughing each other's asses off, while you spend a lot of time being annoyed, disrespected and showering him with your very best bitter bitch face.

female pimp. Madam