Umback started with pony clubs at the age of five and moved to dressage at the age of seven. She then moved into eventing but this ceased at the age of 18 after a serious fall on a cross country course which led to her breaking the fifth vertebra in her neck. She then concentrated on dressage. After her treatment for multiple sclerosis, she returned to riding with the goal of competing at the Paralympics. In 2014, as a Grade III rider she competed the CPEDI 3* in Hartpury, England. In the lead up to the 2016 Rio Paralympics, she based herself Holland so that she could compete on the European dressage circuit and undertake Paralympic qualifiers.