heiress
n.a woman or girl who will receive a lot of money or property when someone dies. Usually, this person is a member of a very wealthy family.
n.a female successor who inherits or is legally entitled to inherit a significant fortune or title.
“The young heiress inherited her grandfather's massive shipping company.”
“As the sole heiress to the tech empire, she spent years learning the business before taking over the board.”
“The novel explores the social pressures faced by a nineteenth-century heiress whose vast dowry made her the target of several opportunistic suitors.”
The feminine form of 'heir'; while 'heir' is increasingly used as a gender-neutral term, 'heiress' remains common in journalistic and literary contexts.
“She was “hardly the glamorous heiress as portrayed,” Thangaraj said.”
From heir + -ess.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.