She forgive her real family....

And rightfully so. They were controlled, and it's not like she forgave them right away. At the end of the day, she is just a child that craves for love

Plus that’s a whole different world and different ppl. Didn’t Kai say that’s a whole different world she wished for? Besides she hasn’t completely forgiven them but she’s moving forward. She has a second chance no need to waste it looking back.