If you cut both pizzas into eighths that means that each pizza has 8 pieces. For two pizzas cut in eighths that would be 16 pieces of pizza. 1/4 of one pizza is 2 pieces. So 16 minus 2 pieces is 14 pieces. If she ate another 3 pieces then we subtract that from 14. 14 minus 3 is 11 pieces. There is 11 pieces of pizza left from the original 16 pieces.