Not a fishwife but a woman one feels being pressed into a difficult role.
From the thisismoney.co.uk
Carly Bawden as Eliza is just about perfect, squawking like a fishwife and singing like an angel.
From the express.co.uk
This sense of the word is still used in Modern English in constructions such as midwife and fishwife.
From the en.wikipedia.org
A fifth Wooden Dolly, also a fishwife, was placed in Northumberland Square in 1958 and still remains there.
From the en.wikipedia.org
She trudged up the stairs, and in a passionately aggressive voice, started bellowing like a small, indignant fishwife.
From the post-gazette.com
Salome Jens adorns the evening physically as a Russian Mata Hari, but she delivers her lines like a fishwife.
From the time.com
Mum just tuts and calls me a gossiping fishwife.
From the express.co.uk
His father was a farmer, while his mother was a fishwife who sold her goods in markets in neighboring villages.
From the en.wikipedia.org
Her Juliet is a fishwife haggling unsuccessfully over a flounder rather than a young girl losing the world and her dear life for love.
From the time.com
More examples
Fishmonger: someone who sells fish
A fishwife or fish fag is a woman who sells fish. Such women were notoriously loud and foul-mouthed as in the expression, To swear like a fishwife. One reason for their outspokenness is that their wares were highly perishable and so lost value if not sold quickly.
Fishwife was a San Diego punk band in the early 1990s, creating powerful, over-the-top live shows. Although Fishwife had its roots in '80s hardcore, the schizoid post-hardcore zaniness that the group unleashed on its audience no doubt had any straight-edge kid running for the nearest exit. ...
A woman who sells or works with fish; A vulgar, abusive or nagging woman with a loud, unpleasant voice; Term of abuse, usually directed at women, implying lack of personal hygiene