There are two possible answers to all of her questions;
First, this is her second life.
Meaning she was reincarnated but if she is indeed reincarnated she should be on the body of a baby not on a fifteen years old girl or maybe she has no memories in her past life when she was a baby until now.
Something must have trigger for her to remember her past life.
Second, when she dies her soul was send to this body and the gods must have given her a new life to enjoy.
She like the second one better,
if it's true then she has to thanks the gods for this opportunity to enjoy the second life to the fullest.
This body has a same name with her past life but now she was adopted she was no longer Li Ai Fei, she is now Jiang Yin Yue, but she like the old name more than the new one.
She stayed at that position until she heard a soft knock disturbing the quietness of the room.
She didn't bother to move knowing that person will soon open the door.
She waited and waited until the one who was knocking still haven't opened the door.
"Should I open the door?" she whispered asking herself.
"Young miss can I come in?" the old maid servant said from the other side of the door.
She immediately stood up. 'Right I am a young miss now' she thought.
"Please" she answered while fixing her hair.
The old maid opened the door and saw the young miss fixing her hair sheepishly looking at her.
"Sorry I didn't know I have to give you permission to enter" she said trying hiding her embarrassment. "I… uh…"
"It's okay young miss." the old maid smiled gently to her,
"I know you're still adjusting to this house" she waited until the young miss finish fixing her hair. "Dinner is ready; please follow me to the dining area"
Ai Fei nodded, "Thank you."
She followed the old woman, "oh… I… uh"
"Do you need something young miss?" the old maid was patiently waiting for seeing she was really nervous.
"I don't know your name" she said.
"Young miss doesn't need to know this old servant's name" the old maid slightly bows, "I'm just a mere servant"
Ai Fei blinked a few times, "But I still want to know you name"
The old maid was surprised when she raised her head to looked at Young miss, "This old servant is called Tang Chun Mi"
"Then can I call you Aunt Chun Mi?" she asked.
"Yes you can"
"It's my pleasure to know you Aunt Chun Mi" Ai Fei smiled widely to Aunt Chun Mi, "oh please stop calling me young miss. You can call me FeiFei"
"The pleasure is mine FeiFei" Aunt Chun Mi smiled back.
She realized that the young miss like her old name that the name given by Master Jiang.