On her behalf childhood starring part as Eli in the critically-acclaimed vampire love Allow Right One In, she received a 2008 Online Film Critics Society Award, a 2009 Wonder Award, and a 2009 Fangoria Chainsaw Award. Before earning the part of Eli, she experienced three rounds of auditions, including a short online casting distribution. She was solid within an Estonian film known as The Arbiter and in a Swedish film entitled Tenderness. Throughout her child years in Falun, Sweden, she participated in regional theatrical productions. In Allow Best One In, her character’s tone of voice was dubbed by celebrity Elif Ceylan; the movie director from the film, Tomas Alfredson, desired the youthful vampire’s voice to become less high-pitched and young-sounding than Leandersson’s organic voice was.