It's because she gave up. She realized that when she tried to go back in time before but it didn't work, accepting the fact the family she grew up with love are now gone and couldn't go back. She thought that it is pointless to seek joy when she knows that she'll never be as happy as before when the family she grew up with was long gone in the past. So, she thought that she might as well just stay in the lamp, as it could seal her consciousness in there without noticing any changes in her surroundings, isolating herself from the reality that she was now alone, sleeping like the dead for eternity without anyone bothering her.
I wish I could upvote your reply
Exactly
Liking this comment only because of Louella Riella's comment (づ￣ ³￣)づ
why is she dead set in returning to the lamp? clearly jibril said to go see the world and you cant do that if youre stuck inside a lamp. she should find ways