Geez! You should take her to look at new tires! You might end up with a convertible that she stores in your garage! LOL!
I have a Bernina 430 and I LOVE it. It is an investment and I don't think either of you will regret her buying it! However- I planned that purchase for months. I can't imagine being able to buy one on a whim! I would have been shocked, too.