Ugen was born in London on 22 August 1991. As a child, she attended Townley Grammar School before going on to study at Christ the King Sixth Form College and then Brunel University London. She achieved national success at a young age, winning both the indoor and outdoor long jump titles at the 2009 English junior championships, as well as the English Schools' Athletics Championships. She was initially a member of Bexley Athletic Club, but later began training with Blackheath and Bromley Harriers Athletic Club. During the 2016 season, Lorraine joined the Thames Valley Harriers Athletic Club. In her international debut, she competed in qualifying only at the 2009 European Athletics Junior Championships, then met the same fate at the 2010 World Junior Championships in Athletics. She was runner-up at the British Athletics Championships in 2011, but failed to register a mark at the 2011 European Athletics U23 Championships.