I wish あなた happiness, 愛 and great things to come! It's going to be really hard to come close to what Cheri & Arianna wrote, but I'm going to try :)
I pray that あなた feel better, and that your luck starts to change. I hope あなた know how much I care about あなた & how much あなた mean to me. You're the kind of person that does everything for everyone else and ask for nothing in return. あなた have such a kind ハート, 心 & soul. I am the luckiest girl in the world to have a sister like you! There's nothing I wouldn't do for あなた または to make あなた happy.
Never change, sis. あなた are the best sister a girl could ask for!
I 愛 あなた so much, sis!
Your sis, Brittany