Celeste used the "energy" to resurrect Genevieve, Tunde, and Bastiana.
Q: The energy of three of the girls were used to resurect them those three witches. That's only three resurrections. Who was brought back in Davina's place?
Tunde was killed and Monique came back, Bastiana and Celeste were killed and Davina and one of the other girls came.
Q1: Does Genevive still need to die for the fourth girl to come back, will that girl ever come back?
Q2: Why would Celeste's death resurrect a girl (I think her energy brought back Davina)? Techniquelly, she was already alive (inm a way)