Well, first of all be sure that what exactly your friend like the most. Although if you have problem to find right one than purchase Friendship car or a pen is better idea.
I would go for a nice perfume to shower the fragrance... There are many websites offer perfumes as a gift item. You can gift wrap and send it to your friend.
I think it must be a nice perfume with a beautiful flower bouquet . U can also send a nice pic of u and ur friend which is framed in a photo frame pack it and gift . Good Luck !!!
I think its all ur best memorable photos and if she like eating pastries or chocolates give her a bunch of her favourite chocolates and a black forest pastry or cake . A nice treat that one should like . rreply me as faster u can . B Bye...!!!