What will happen if Mrs. Aouda if she is not burnt alive?

From the text:

"Yes," returned Sir Francis, "burned alive. And, if she were not, you cannot conceive what treatment she would be obliged to submit to from her relatives. They would shave off her hair, feed her on a scanty allowance of rice, treat her with contempt; she would be looked upon as an unclean creature, and would die in some corner, like a scurvy dog. The prospect of so frightful an existence drives these poor creatures to the sacrifice much more than love or religious fanaticism.

In the book its said that there are two options for a girl if her husband dies. Either she will be burnt alive or live a life of a widow. And if Aouda isn't burnt alive, she has to live a life of a widow. Life of a widow is worse than death. You will be left alone in a dark room, plain food everyday, shave off your hair, would be treated as a creature whom everyone hates and much more. Its said that, a widow at that time also couldn't attend any functions, not even her sisters wedding. So if Aouda wasn't burnt alive, she would live a life of a widow. But that didn't happen as Passepartout saves her.