She played Madame Thenardier in Les Miserables at the Palace Theatre[3] and was in the original 1994 cast of Sam Mendes' production of Oliver!

With other members of the West End theatre community, Nalder participated in fundraising campaigns,[7] including cabaret shows and performances in Soho, to raise money to support AIDS awareness and research.

[8][1] In 2021, screenwriter and producer Russell T Davies based the character of Jill Baxter in his Channel 4 television miniseries It's A Sin, on Nalder's life at the time.

Nalder and Davies first met at the age of 14 while performing in youth theatre in West Glamorgan in Wales and remained friends thereafter.

[7][10] Nalder wrote the book Love From the Pink Palace, published in 2022[12] and shortlisted for the 2023 RSL Christopher Bland Prize.