is an Australian female professional wrestler working under the ring name Shazza McKenzie. She is known for her work on the Australian independent circuit in promotions including Professional Wrestling Alliance where she is a one-time PWA Tag Team Champion and a two-time PWWA Champion currently in her second reign. In addition to her work in Australian promotions, Allison is known for her work in American wrestling promotions including SHINE Wrestling and SHIMMER Women Athletes where she is a one-time Heart Of SHIMMER Champion. Allison began following professional wrestling at the age of 16. She cites Trish Stratus as a major source of inspiration with her combination of "toughness and sexiness". She also has stated her favorite wrestler is Brock Lesnar. Once Allison saved enough money, she devoted her time to training at a local wrestling school.

Once she completed her training in 2008, Allison worked her first professional match for Australasian Wrestling Federation. She spent her early years wrestling solely in Australia from 2008 until 2012 in numerous promotions including Insane Championship Wrestling, Pro Wrestling Australia, Melbourne City Wrestling, Newcastle Pro Wrestling and Riot City Wrestling. Returning in 2015, McKenzie wrestled her former tag partner Veda Scott at SHIMMER Volume 72 where she lost to Scott. She sustained a second loss at SHIMMER Volume 74 by Melanie Cruise. She rebounded with a victory at SHIMMER Volume 75 against Marti Belle. On October 10 at SHIMMER Volume 76, McKenzie lost to Courtney Rush (later known in Impact Wrestling as Rosemary). Later on at Volume 76, McKenzie wrestled in a battle royal for a title match for the SHIMMER Championship but the match was won by Candice LeRae. On October 11, McKenzie wrestled at SHIMMER Volume 78 in a match won by Allysin Kay. Later that day at SHIMMER Volume 79 she won a four-way match, defeating Allysin Kay, Mia Yim and Veda Scott.

During June 2016, McKenzie wrestled in Volumes 81, 82, 83, 85 and 88. She finished out her year in SHIMMER at SHIMMER Volume 89, with a victory over former mixed martial artist Shayna Baszler in a No Disqualification match.

McKenzie returned on July 8, 2017 at SHIMMER Volume 92, teaming with Madison Eagles and Saraya Knight in a tag match defeating team Trifecta (Mercedes Martinez, Nicole Savoy & Shayna Baszler). Later on July 8 at SHIMMER Volume 93, McKenzie won her first Shimmer title after defeating Nicole Savoy to become the new Heart Of SHIMMER Champion. Over the course of Volumes 94, 95, 96, 97, 98 and 99, McKenzie successfully retained the Heart of Shimmer title. McKenzie debuted on March 17, 2012 at SHIMMER Volume 45, teaming with Veda Scott in a tag match won by Melanie Cruise & Mena Libra. She returned on March 18 for SHIMMER Volume 47, where McKenzie won her first singles victory in SHIMMER, after defeating Saraya Knight by disqualification. She returned later for SHIMMER Volume 48, where she won her second singles victory over Rhia O'Reilly. On October 27 at SHIMMER Volume 50, McKenzie scored her third singles victory, defeating Santana. At Volume 50, she teamed with Veda Scott in a tag match won by team Made In Sin. On October 28 at SHIMMER Volume 52, McKenzie lost her first singles match against Mercedes Martinez.