In September 2014, Lewis was selected in Ireland's squad for a three-match T20I series against
South Africa, played at
a neutral venue in Birmingham, England. She sat the first game out, but was included for the final two games, scoring five runs on debut and then 12
not out in the third game. On debut, Lewis was 13 years and 166 days old, breaking the record set by her teammate
Lucy O'Reilly for the youngest T20I player. She also became the first international cricketer born in the 21st century. Across all men's and women's international cricket (Tests, ODIs, and T20Is), only Pakistan's
Sajjida Shah has played at a younger age. After her debut series against South Africa, Lewis next played at international level in August 2015, when she was named in Ireland's squad for
a three-match series against
Australia. She had less success, however, in the other matches, scoring four runs in the second game and ten in the third. Later in the year, Lewis also played in the
2015 World Twenty20 Qualifier in Thailand. At the
2016 World Twenty20 in India, she played in two of her team's matches (against
New Zealand and
Sri Lanka), but had little impact. The following month she was named in the ICC Women's Global Development Squad. In October 2018, she was named in Ireland's squad for the
2018 ICC Women's World Twenty20 tournament in the West Indies. In August 2019, she was the leading run-scorer in the
2019 Netherlands Women's Quadrangular Series, with 180 runs from six matches. The following month, she was named in Ireland's squad for the
2019 ICC Women's World Twenty20 Qualifier tournament in Scotland. In July 2020, she was awarded a part-time professional contract by
Cricket Ireland for the following year. In August 2021, Lewis was named in Ireland's squad for the
2021 ICC Women's T20 World Cup Europe Qualifier in Spain. In Ireland's opening match of the tournament, against
Germany, Lewis scored 105
not out to become the first cricketer for Ireland to
score a century in a WT20I match. In November 2021, she was named in Ireland's team for the
2021 Women's Cricket World Cup Qualifier tournament in Zimbabwe. In May 2022, Lewis was named as the captain of Ireland's team for their home series
against South Africa. In the first match of the tour, Lewis scored her 1,000th run in WT20I cricket. In the next match, Lewis earned her 50th cap in the format. On 26 August 2022, Lewis earned her 100th international cap for Ireland, scoring 92 in her side's victory against
the Netherlands. In August 2024 Lewis made her highest score in international cricket with 119(75) to guide Ireland to a win over
Sri Lanka and draw their T20I series. A month later she made 72(56) as stand-in captain to lead Ireland to their first ODI win over
England since 2001. Lewis was named full-time Ireland
captain in October 2024, replacing teammate
Laura Delany in the role. Head coach
Ed Joyce commented saying that "Gaby, as a cricketer and leader, has continued to grow and improve year-on-year. Her analysis and reading of the game are excellent and her captaincy in Laura’s absence for much of this summer was outstanding. She is ready to take on the role of captain and I’m excited to see where she can take the team in the next few years." She was named as captain of the Ireland squad for their T20I and ODI
tour to Bangladesh in November 2024. She made her 50th appearance in the ODI format
during the India tour in January 2025. Lewis captained the Ireland squad for the
2025 Women's Cricket World Cup Qualifier in Pakistan in April 2025. ==References==