Hi,
Our daughter was born 1.6 k"g (less than 4 pounds).  Based on our experience my advise is:
1.  Always remember that she is premature.
2.  That means that she will develope slower than normal.
3.  So never compare your daughter to others.
4.  She might be a bit more sensitive (not necessarily).
5.  Treat her as a normal child.....  
6.  At most cases she will catch up in size as well.
My wife was also born less than 4 pounds and if you saw her today you would never believe she was born premature.
I wish you'll grow your daughter with good health and that she'll bring you a lot of joy, happiness, and love.