The animal that Alissa had found to possess was a bear. Coincidentally, it was the same bear that had killed the husband of Elena. Nonetheless, that didn't matter to Alissa, because Elena's life was nothing to her. Especially after Elena had gained resistance against her possession. From that day on, Alissa no longer planned to associate herself with Elena, since she's basically useless and a nobody to both her and Mark.
It didn't take too long for Alissa to return to the vile woman's grave with the bear's body. Approximately, it took nearly thirty minutes for Alissa to return, obvious from the fact that sun was just an inch close from passing through the horizon.
Dusk broke free when the evil woman was finally set free. It was nighttime. The right time for chaos to erupt, and the time when the woman is apparently much stronger than in the afternoon...
