17 year old Princess Jahanara was apparently so distressed by her mother's difficult labor that she started giving gems to the poor in hopes of earning some divine intervention. Seeing as her mother died from postpartum hemorrhage after childbirth.
Mahal requested promise from her husband Shah Jahan, that he build a monument dedicated to their love. So, when Mahal died, she was temporarily buried in Burhanpur in a garden known as Zainbad. Few months later, Shah Jahan has her exhumed and returned to Agra. Not long after, planning of the Taj Mahal began.
With the death of the empress, Jahanara became the uncrowned woman figure head next to her father. Then she entrusted with the charge of the Imperial Seal and made Malika-E-Hindustan Padshah Begum - The First Lady of the Empire.
She took on many responsibilities, including operating the harem, from food to clothes to tutoring, caring for her younger brothers and sisters.
Shah Jahan went into deep mourning for a period of two years. She bringing her father out of mourning and restoring normality to a court darkened by her mother's death and her father's grief.