Joênia made history in 2008 when she argued a case brought by five indigenous groups to have their land officially demarcated as an Indigenous Territory, a type of tenure that confers indigenous peoples inalienable rights over their traditional homelands.
Joenia ta kafa tarihi a 2008 a lokacin da ta ƙalubalanci wata rigima da wasu ƙungiyoyin 'yan ƙasa biyar suka kawo, domin a shata musu ƙasarsu a hukumanci a matsayin ƙasarsu, irin ƙudurin da yake ba wa 'yan ƙasa babbar dama a kan garuruwansu na asali.