African Violets do not divide (unless there are offsets).
Suddenly wilted could mean root failure: salt build up, soil compaction, root bound, hydrophobic soil... I would tip it out of its pot, shake off as much soil as possible and give it some fresh soil. Even the very largest violets need only a 5" pot. Mine are all in 4" pots.
Do you fertilize? It looks a little pale.