Those three chapters were wonderfully paced. Others keep calling this girl selfish but this is a very emotional realistic manhwa. Unlike others w which usually skip this process or have the lead accept their situation, she's in denial and couldn't even believe it's all real.
This is the first time she's able to actually TALK to someone about her frustrations and understanding what happened. And with that she comes to acceptance and wishes to move forward with her new life. She sees that she's loved and wishes for her new mother to recover.
People who call her selfish aren't understanding that not everyone can adapt so quickly. She's in the body of a baby in an unknown world and couldn't even communicate. It's normal for her to feel the way she does. She can't just get over it, it's not easy. She lost her family.
I seriously love this manhwa, definitely looking forward to more.