MaryahLu

"Why do the main character's parents often get the short end of the stick?"
That is what Mila asked while looking up at the sky. She was grumbling toward whoever sent her inside the novel she read before she died.
She becomes the mother of the main character, whose parents are both dead. Mila's character was merely a tool for the MC's character development.
It's a simple, fix-all solution. The author wanted to make the audience instantly sympathetic towards the main character, and the best thing he did was to have the MC's parents die.

After she avoided her death in the original plot, death flags kept coming for her. 

Will the original plot not end if she's not dead?

....

proofreader: Aserehtam

Main character's parents must die

"How is she?" Mila asked Berto right away.

But Berto couldn't answer Mila's question right away. He is not a pediatrician, and he just sent the baby to the right ward for toddlers. He then grabbed Mila's shoulder and seriously asked, "Where did you get that baby? Mila, it's a crime to steal babies!"

"What?" Mila scoffed at what Berto accused her of. She gently pushed Berto away from her and explained, "She's one of us. From another world."

"You didn't mention any character that is still a toddler."

Mila was pacing in front of Berto while she talked to him.

"I don't, but she is definitely not a baby in our world. I don't know how, but she turns like this."

Mila didn't consider any effect on their bodies of trying to live in a world they were not originally born in because she was physically fine during the whole three years she stayed on Earth.

"Good night, My princess."