How can a woman please Allah and not anger her husband, who gifted her gold from money mixed with both lawful and unlawful sources, and who insists that she wear it, given her knowledge that the source of the money might be suspicious?

If most of the husband's wealth is lawful, there is no harm in benefiting from it with the intention that it is from his lawful wealth. However, if most of it is unlawful, it is better to avoid it. If the husband commands his wife to wear jewelry he bought with mixed funds, it appears obligatory to obey him, because avoiding doubtful things is recommendable, not obligatory, and the husband's obligatory right takes precedence. But if he gives her something that is inherently unlawful money, it is not permissible to benefit from it, and she is not obliged to obey him in that, because obedience is only in what is good and permissible.