Farewell message for a friend leaving the country :-(?

Hey i'm in need of help here, I have a friend of mine that I've known for about a month, she's been doing some travelling here and we are so much alike that I have grown a really strong connection with her. The thing is she leaves tomorrow to go back home and has her whole life to go back to and I just wanted to send a farewell message for her. I'm really sad that she's leaving and don't want her to go but she has to, so I want to send the best farewell message. any help would be the best!