[8] In the 2010 short film The Long Autumn, about a boy (Devon Bostick) that grows up alone on a strange island and eventually encounters fellow humans but needs to gain a pair of boots before being accepted, she was the sweetly naive serving girl Ladeeda.

[9][10] Quirky romantic/drama Old Stock (2012)[11] saw her playing sparky love interest Patti, an arsonist serving community service teaching dance classes at an old peoples' home.

2018 short comedy-drama film Softcore[18] saw Melanie Leishman co-star with Alyssa Owsiany as a pair of bridesmaids that bond over exchanging the bizarre stories of their sexual awakenings.

The same year, in Christmas set romantic comedy Single All the Way[21] as Ashleigh, young mother of two small children and a supportive sister to the lead Peter (Michael Urie).

[26] Incidentally True Confessions of a Hollywood Starlet also featured her future Todd and the Book of Pure Evil co-star Bill Turnbull in a small role.

[43] In 2022 – Leishman played Remi Belcourt in episode "Between" of medical drama Transplant,[44] a patient admitted to the emergency department with burns whose accident ends up revealing some uncomfortable truths about her boyfriend.

In episode "One Wild Night" of police procedural drama Hudson & Rex, Leishman plays bridesmaid Quincy Thomas[45] whose straight talking about a murder victim after a bachelorette party leads to her being a suspect.

[47] In the animated series Total Drama Island reboot Leishman voices Emma,[48] one of the main characters who are contestants competing to win a million on a reality TV show.