Arena has used her fame to help several causes and is a patron to two charities in Australia: child protection organization Barnardos and "Soldier On", which supports rehabilitation for veterans, ex-service men and women. In her support she is an official patron for a charitable organization 'Soldier On', which assists mentally and physically wounded Australian soldiers. Arena said, "It's vital that Australian soldiers have access to support when they return from overseas, and 'Soldier On' will make a much needed difference in the lives of wounded veterans and their families. 'Soldier On' is the first charity of its kind in Australia and I am honoured to be a Patron."