In October 2014 she received an invitation to the U-23, but was not used. She played her first international match in May 2015 in a 3-1 win against the
England U-23 team. In October 2016, she became the third goalkeeper for the senior national team's international match against
Iran, the first of a European team against the Iranians. For the
2019 World Cup she was nominated as the only Swedish player without international caps. She was second goalkeeper but was not used yet. Falk played her first game for the senior national team at the
2020 Algarve Cup, in which the three nominated goalkeepers each played one game, in the game against
Denmark, which was lost 1-2. During
qualifications for the Euro 2022 when regular goalkeeper Hedvig Lindahl was injured, Falk was used in the last four qualifying games and kept four clean sheets. With a 2-0 win against
Iceland in the penultimate game, the Swedes qualified early for the European Championship finals. Falk was selected for the
2020 Olympics. She played in the third group game against
New Zealand when some regular players were rested after the two opening victories. In the end, like in 2016, the Swedes won the silver medal. She was nominated for the
Euro 2022, but was not used. In the
qualifications for the 2023 World Cup she played in goal three times and qualified with her team for the finals in Australia and New Zealand. On 13 June 2023, she was included in the 23-player squad for the
2023 World Cup. She played in the third group game against
Argentina when some regular players were rested. Her team was defeated 1-2 defeat in the semi-final against
Spain. With a 2-0 win in the game for third place over
Australia she won the bronze medal. Falk was Sweden's first choice goalkeeper for
UEFA Euro 2025, bowing out in the quarter-finals despite Falk saving four penalties in their shootout against
England, keeping out three of their first four. Falk took Sweden's fifth penalty herself but missed what would have been the winner. England instead won the shootout in sudden-death, despite Falk saving a fourth spot-kick. In all, Falk saved penalties from
Lauren James,
Beth Mead,
Alex Greenwood and
Grace Clinton. == Personal life ==