I have no experience with prems, but i just wanted to say my daughter was born at 42 weeks, and was only 2.7kg, so you can tell your friend she did fantastic growing her to 3kg at 35 weeks!

Just remember to give your friend lots of cuddles, and also maybe something special for her? Like a nice giftpack of shower stuff or something to make her feel nice? I'm sure she is exausted from all of this, and not at all like she was thinking the first few weeks would be like.