This old lady's name was Aspen Nash, she was a noble of the Luminous Kingdom appointed to protect the Library. This task was always given to Nash Noble Household for centuries.
This Aspen didn't want to come here but end up offending a higher noble of the Nash family and appointed in this barren place.
First, she was quite unwilling but after coming here she soon found there is no one above her and only Grand Prince can order her around, but even he didn't care about what she doses and leave her alone.
This made Aspen fell in love with this place she can do anything and defraud anyone who isn't important to Grand Prince. She began to live her life to the fullest and didn't want to go back anymore.
Now it has been already ten years and she was living a carefree life; her duty was only to protect this place and no one dares to mess with the Luminous Kingdom so even this was just a comfortable job for her.