in the new chapter released on friday , clinton shared her experiences as a grandmother and how they had motivated her political plans .
she recalled how disorganized she had been before the birth of chelsea , whereas chelsea had been so composed before becoming a mother .
the clintons ` whooped ' with delight when charlotte was born last september and hillary noticed bill becoming emotional .
while she had been nervous about being a mother , being a grandmother is ` pure joy ' - and has made her think about all children 's futures , she said .
she is expected to announce her run for president on sunday .