The next day, Kira and Marceline got busy preparing for the wake of Aunt Brianna. On the same day, she decided to cremate Aunt Brianna's body. It was according to her wish.
She left Marceline a letter. It was an already-prepared letter, to be given to Marceline once something would happen to her. It seemed like Aunt Brianna already anticipated her passing away.
Marceline found a quiet place wherein she read Aunt Brianna's last message for her.
[ My dearest Marceline, you are like a daughter to me. You know how much I care for you. Please don't be sad if ever I have to leave you behind. Just be strong always. I know you can overcome whatever challenges you may encounter in life. ]