Question: does bonnie come back to life in season 5

Answer: Yes, Now that everything is done, Katherine finds Qetsiyah to ask for her cure only to find that Qetsiyah changed her mind and all she wants now is to die and meet her true love on the Other Side. She kills herself without finding a cure for Katherine. Katherine is once again alone since now that Bonnie is back, Caroline asks her to move out of their dorm. Nadia (Olga Fonda) appears to ask her to go back with her to Prague, but Katherine turns her down. Caroline is shocked by the fact that Nadia is Katherine's daughter.