I became an extra that is loved

Lily was reborn as a charater in a novel she read, The problem is shes not a cannon folder?! who was she and why was she born in the villians family

"Theia father got you your favorite stuff animals!"
why is the big boss acting like a daughter fool..

"Theia come play with your favorite brother!"
"Theia would rather read with me instead"
why are the main villians fighting on who im playing with arent you supposed to hate me?!

"Theia i want you to be my sister so marry my brother!"
why dose the heroine want me to marry her brother!?

"Theia..... please don't ever leave me.."
And why is the heroine brother obsessed with me?!?!

I'm an extra that is loved?!?!