Dear Saivasanthi,
Rather than asking for a draft of the letter, it is better if you write it yourself and upload it here. Some senior like me will correct it. If you try, you will come to know your mistakes. If you get ready made draft, you will never improve.
As such you need to work hard to improve your business writing skills. The quality of your post is very inferior. Who is "she" in your post? It appears that you are referring to some woman employee of your company who is on sick leave. But then you cannot use pronoun unless you use the noun. You need to master these basics.
All the best!
Dinesh Divekar