I like the idea of setting up a sewing space and small project for her and letting her sew with Lily unaware. Surely, if she's been dealing with a problematic machine, she will gush about how easy and fun it is to sew with this one and how she'd love to get one of her own. ;) I wouldn't wrap the manual, she might want to refer to it while working on the little project, but I WOULD wrap the empty box and give it to her after she's had some fun with HER new machine!