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

"You were anxious that Christopher wouldn't return soon?"

Mila asked again after hearing Princess Ginalou open up to her.

They went to the princess quarters and had a few snacks on their table.

She doesn't have any problem acting superior toward the princess, even if she doesn't have a title anymore. It was the princess who kept treating her like she was still the duchess and also took her offer to keep their relationship close as the princess's mother-in-law.

"I-it's not like I didn't trust your words. I am just anxious."

Princess Ginalou fidged and fiddled with her skirt while avoiding Mila's gaze.

"B-but what if he won't come on time? Father will use this to make us not marry in the end."

"Don't worry. Even if he doesn't appear on time, I will make sure you will be marrying the real Christopher. It's the other thing you were worried about, right?"

"Don’t bite your lip. I’ll do it for you instead."