When did women & children get the right to handle their own assets?

My great aunt won every bet (14) at the horse race at the fair held in NW Washington, DC. around 1890. I went back in time to give her money. The time was just before Margaret Dozier's brother (Candler or Chandler) bought Pembroke Chemical Company or Pennington (?) Chemical Company in Atlanta, Georgia. The company later became Coca-Cola in 1913/1914. The date is important when the fair took place. They lived in Washington,DC-French Quarter and I visited the low income building at 5125 Upton. I need to locate the date and any information about what happened. Apparently, women could not own assets or money. When did they change the law about women and children having the right to own property in Washington DC?