Adams posted on social media on Friday night that she has ended her involvement with Cowan, her manager of 14 years, and joined the Halo Sport agency.
"Hey all – just a quick note to let you know that I have made some changes to the structure of my team," Adams posted.
"Nick Cowan and I have agreed to part ways. Nick has decided to pursue other endeavours and I wish him well in those and thank him for all of his work over the years.
"I have made the decision to join the team at Halo Sport and I am looking forward to working with them."