Beney was born in Yverdon-les-Bains, a picturesque town in French-speaking Switzerland, into a footballing family. Her father, Nicolas, is a former goalkeeper who represented seven clubs and won caps for the Switzerland youth teams, while her aunt, Noemie, won 45 caps for the senior women's team. Her older brother, Romeo, also currently plays for FC Basel.
Beney started playing the sport herself when she was eight years old, first with FC Saviese before arriving at Young Boys via spells with FC Sion and Saxon Sports. It was with the Bern club that she would get her senior breakthrough, impressing so much in her debut campaign that she was voted into the Swiss Women's Super League team of the season, aged 16.
At the same time, Beney was thriving in the Switzerland youth national teams, named to the best XI at the Under-17 Euros in 2023. Inka Grings, then head coach of the senior team, took great notice of her performances and called the teenager into camp a few weeks later, just before La Nati were heading to the World Cup in Australia and New Zealand.
Beney took full advantage of the opportunity, too. Granted a debut in a friendly with Zambia, the versatile forward bagged an assist and was a surprise inclusion in Grings’ World Cup squad three days later. However, a devastating ACL tear in training the very next day robbed her of the chance to star at the tournament and sidelined her for a year.