In April 2008 Kumwenda played for Malawi in an away series against England. In August 2009 she was tournament top scorer at the 2009 Netball World Youth Cup. She subsequently represented Malawi at the 2010, 2014 and 2018 Commonwealth Games and at the 2011 and 2015 Netball World Cups. Kumwenda was the top goal scorer at three successive major tournaments – the 2014 Commonwealth Games, the 2015 Netball World Cup, and the 2018 Commonwealth Games. At the 2015 Netball World Cup she was also named Player of the Tournament. At the 2018 Commonwealth Games she scored 41 goals as she helped Malawi defeat New Zealand 57–53.