i love suprises.. I like to wait until the end though.. when i gift something I love to see the looks i get when I act giddy.. all my friends think i am nutso! if you can pull it off.. I would get her car loaded up to go and then say.. "oh, you forgot a box" and then give her a plain box with the other box inside.. or do the opposite.. have it in the sewing room inside a plain box... ask if it is hers.. when she says no.. ask her to open the box and let you know whats inside.. while you run to the "bathroom" or something..