"饭店老板娘" 英文说法是 "restaurant proprietress"。
"Proprietress" 来源于拉丁语 "proprietarius"，意思是 "the owner of something; a woman who owns or manages a business"。
例句：
The proprietress of the restaurant is a very friendly woman.
(这家饭店的老板娘是一个非常友好的女人。)
She is a hardworking proprietress who always makes sure her customers are satisfied.
(她是一个勤奋的老板娘，总是确保顾客满意。)
The proprietress of the store greeted us warmly as we walked in.
(商店的老板娘热情地问候我们走进去。)