It's due to her specific comments as Speaker of the House when leading a vote to dismantle prohibitions established during the Obama admin.
> when asked whether lawmakers and their spouses should be prohibited from trading stock while in Congress, Pelosi said, “No,” adding that “this is a free market.”
It's also because her family profits disproportionately:
> Pelosi's husband, investor Paul Pelosi, frequently trades significant numbers of stocks. With her husband's assets considered, Pelosi ranks among the wealthiest members of Congress, an Insider analysis found.
> when asked whether lawmakers and their spouses should be prohibited from trading stock while in Congress, Pelosi said, “No,” adding that “this is a free market.”
https://apnews.com/article/business-nancy-pelosi-congress-86...
It's also because her family profits disproportionately:
> Pelosi's husband, investor Paul Pelosi, frequently trades significant numbers of stocks. With her husband's assets considered, Pelosi ranks among the wealthiest members of Congress, an Insider analysis found.
https://www.businessinsider.com/we-are-free-market-economy-p...