Second Son Gao's wife, Chang Taohua, was indeed snatched away, but Chang Taohua was from a very poor family. After living a good life at the Gao family, she became devoted to Second Son Gao.
Not only that, Chang Taohua is a very ambitious person. To make her own family wealthy, she involved her whole family in working with the Gao family, helping them commit many evil deeds, accumulating quite a bit of silver.
However, Chang Taohua was clever. She knew that making money through shady ways would eventually lead to trouble, so she didn't let her family show any signs of wealth. Instead, she hid the silver she earned and had Mrs. Chang take the silver to her maternal grandfather's house in neighboring Hukang County, using it to buy fields and land.
But all of that silver was earned by Chang Taohua and her family. As for Gao family's gold, the Chang family couldn't touch it.
