Because she thought that wit craft & the supernatural were to blame for the deaths of her unborn children
A hoax can be intended with multiple purposes. Although many times a hoax can be a joke, or for personal entertainment... At times, it can also be with the intention to send out a message, which can be considered a "social change".
For example, let's say hackers hack into international banking systems. Although it may be a hoax, and without the intention to actually steal/for personal entertainment. It could be with the intention to prove that international banking systems need to improve their security.
That creates a social change.
It starts making society realizes their strengths as well as their weaknesses. It makes them value what they have, and also make them think about what they can improve on.
