Christmas & Sisters

I had a nice Christmas at home. My human hired someone to attend to my needs. I got to stay with my sister.
She growls at me sometimes and bats her paw at me.
And hisses.

I don't know why she doesn't like me.

I try batting her head with my paws. I try jumping on her back. I try joining her on the fluffy pillows. I try stealing her food.

And she still doesn't want to be my friend.

Do any of you guys know how to solve this problem?