Peters began her acting career in theatre, with appearances in various productions including The Scarlet Pimpernel (1991), Guys and Dolls (1991), Into the Woods (1992), Bedroom Farce (1996) and Noises Off (1997).

After leaving Coronation Street to pursue other opportunities, she competed in and reached the final of Celebrity MasterChef, before returning to the stage to appear in various touring productions and West End theatre roles.

[2] After various stage roles including The Scarlet Pimpernel (1991), Guys and Dolls (1991), Bedroom Farce (1996) and Noises Off (1997), Peters made her television debut four years later in the BBC medical drama series Cardiac Arrest.

[11] Dominic Cavendish of The Daily Telegraph said, "Ma was played with hilarious gruffness and rolling pin obduracy by Wendi Peters.

[14] A year later, she played Princess Puffer in Aria Entertainment's London revival of The Mystery of Edwin Drood, a musical comedy by Rupert Holmes, based on Charles Dickens' unfinished novel.

[16] In 2013, Jonathan Miller directed Githa Sowerby's Rutherford and Son in which Peters starred as Mrs Henderson to critical acclaim.

[17] Libby Purves of The Times said, "Wendi Peters has a fabulous cameo as a whining petitioner, unsentimentally illustrating the company's workforce challenges".

[21] Peters co-starred with Ian Reddington and Christopher Villiers in the 2015 production of Joan Littlewood's musical Oh, What a Lovely War!, directed by Terry Johnston, which toured nationally.

[25] Peters then starred in a UK tour of Salad Days in 2018, followed by a stint as Sylvie in the off-West End run of Call Me Vicky.

[29] Peters returned to the stage starring as the Wicked Queen Carabosse in the Stockport Plaza's annual pantomime, Sleeping Beauty, for the winter 2024-25 season.