Hi... rather than completely surprise her with a machine that she didn't get to check out first, why don't you give her a hand or computer written gift card entitling her to get the machine of her choice. If you want you can include a 'not to exceed' monetary amount.
That would be the greatest gift my hubby could give me! He's given me some really expensive gifts in the past...a mink coat with my initials on the inside, and I had told him for years that I would never want a mink. I think I've worn it maybe 10 times...in CA of all places. Now I would have preferred a gift card, LOL.
warm quilt hugs, sue in CA