Nimmo started her career along with a lot of other Scottish actors and comedians in the 1995 sketch show Pulp Video which was partly written by her husband Greg Hemphill and his co-writer Ford Kiernan.

[2] After taking a break from acting, Nimmo returned to the stage in Glasgow as So-Shy in a production of Sandy Wilson's pantomime musical Aladdin.

She briefly appeared in the Scottish comedy television series Rab C. Nesbitt, and played Elizabeth Macquarie in the docudrama The Father of Australia.

[5] In 2014, she appeared as a guest in a children's special of Pointless Celebrities alongside fellow Balamory star Andrew Agnew but lost in the head-to-head round.

[6] In 2016, she starred with John Michie and Lorraine McIntosh in the BBC One Scotland horror comedy West Skerra Light, which was written and directed by her husband Greg Hemphill.

In August 2023, Nimmo and Hemphill completed filming the series version of Jules and Greg's Wild Swim which aired in January 2024 on BBC Scotland.