The donation must be some kind of estate tax fraud. If she truely wanted to improve communities she could pay living wages to the workers that earned her (husband) all that loot.
Mabye provide full benefits to empolyee's famlies.
Or foster more a responsible production of beef using vegetarian diets, sustianable grazing, and humane meat rendering.
Or take a leadership role in ending genetically modified farming.
Or she could keep a McDonnalds restraunt from running a family owned diner out of business.
Money may build a new subdivision in a suburb, but a community can't be purchased.