Answer: she thought that witchcraft and the supernatural were to blame for the deaths of her unborn children.
In <em>The Crucible</em>, Anne Putnam, the wife of Thomas Putnam, had lost seven children out of the eight she had. As she is a supersticious person, she believes these children were killed by witchcraft. Thomas Putnam, on the other hand, also believes that witches should be persecuted. However, his motives are financial.