Allen began her football career playing for Penrith Nepean United in Western Sydney. After five years with the club her defensive talent was scouted by W-League side Sydney FC where she earned a Scholarship with NSWIS.
In 2008, Allen earned a scholarship with New South Wales Institute of Sport. She earned her scholarship with The Australian Institute of Sport in 2009 and she still holds it currently.
Allen was 15 years of age when she started playing for the professional Australian W league Sydney Fc
Allen was one of three players along with Catherine Cannuli and Servet Uzunlar, to become the first women to ever sign multi-year contracts in the W-League.
On 9 June 2014, Allen was acquired by the WNY Flash of the Women's National Soccer League in the United States. WNY Flash defender Australian International Teigen Allen subbed in, marking her debut in the WNY Flash vs Seattle Reign on 22 June at Sahlen's Stadium. She was waived by the Western New York Flash in September 2014.
On 29 August 2014, Allen signed with Sydney FC returning to her original home club, with two others Kyah Simon, Servet Uzunlar where all three will once again line up for the two time premiers after departing the Western Sydney Wanderers.
In September 2016, Allen joined Melbourne City. Melbourne City FC have become the first W-League Champions to go back-to-back after defeating Perth Glory 2–0 in the 2017 W-League Grand Final:
On 31 December 2016, Vålerenga signed Allen from Melbourne City. The sports director Egil Ødegaard said she will affect the Norwegian top-flight in 2017.
Allen joined Sydney FC once again ahead of the 2017–18 season.
On 29 January 2008, at 13 years old, Allen played her first international with the Australian under 17's against USA at North Harbour Stadium, Auckland, New Zealand In 2009, at only 14 years of age, Allen was selected to compete at the AFC Under-19 Women’s Championship. The Australians were knocked out after the group stages; however an impressive performance from Allen saw her become one of the key figures in the Australian under-16 team that won the AFC Under-16 Women’s Championship later that year The Australians were knocked out after the group stages; however an impressive performance from Allen saw her become one of the key figures in the Australian under 16's
Allen competed in the 2009 AFC Women's Championship with the Young Matildas. for the 2009 AFF U16 Women's Championship in Myanmar.
In 2010, Allen was named in the Matildas team to play in the 2010 AFC Women's Asian Cup, which the squad went on to win. Allen made her international Senior debut as a 15-year-old in the opening game again Vietnam
At the 2011 FIFA Women's World Cup in Germany, Allen was one of the youngest players in the squad. 2012 saw Allen continue cementing her place in the Matildas squad in their attempt to qualify for the 2012 London Olympics.The Australians finished third in the qualification tournament in Jinan, China, coming from behind to defeat South Korea
In May 2014, Allen competed at the AFC Women's Asian Cup and helped Australia to finish second, thereby qualifying for the 2015 FIFA Women's World Cup. She was reported as "almost unstoppable so far and virtually flawless every minute she plays."
With Awards:2009: Teigen Allen (Soccer) – Sydney Combined Press Sports person of the Year
2009 Australian AFC Under-16 women’s Championship
With Melbourne City FC:W-League Championship: 2016–17
With Sydney FC:W-League Premiership: 2009
W-League Championship: 2009
AFC Women's Asian Cup Winners: 2010
AFC Under-16 Women’s Championship Winners:2009