I thought that she had steered some $78,000,000 in Federal projects to her husband's state and then there were also some questions about the business interests of her family members in China[0]. Also Deripaska[1] just announced he's funding an aluminum plant in Mitch McConnell's state so I suppose it does involve billions in Russian graft.
[0]https://www.vanityfair.com/news/2019/06/elaine-chao-china-tr...
[1]https://www.cnn.com/2019/04/15/business/rusal-russia-kentuck...