I would say to her, "I am so thrilled that you are visiting me. While you are here I'd like you to try my new machine and see what you think of it?" When she tries it and likes it just say, "I am so glad you like it. Your friendship means so much to me, I wanted to do something special for you. The machine is yours with love".
I love surprises.
Sorry, I didn't see the one above mine that is similar.