Surely Louise has to be in the dance off, the only way she can avoid it is if she is top, Claudia comes second and Danny and Ore are the bottom 2 with the public:
Ore = 4 (Judge vote) + 1 (public) = 5
Danny = 3 + 2 = 5
Louise = 2 + 4 = 6
Claudia = 2 + 3 = 5