We know that Grace redecorated the dining room at some point in her life. In fact, we think she did this redecorating after her husband Herbert passed away in 1930. A photograph of this room from about 1901 reveals a different dining room table, a marble-top buffet in place of the highboy, and a heavily patterned wallpaper.
The table and highboy you see today are Chippendale reproductions Grace purchased. Chippendale furniture originated with London cabinetmaker Thomas Chippendale in the 18th century, but it saw a resurgence in the first decades of the 20th century.