Pete said:

Is she absolutely sure that the new version of the attachments does not work on the older model?  That is one of the huge selling points for KA – stuff is interchangeable!

The caution would be making sure that something like a dough hook would be for the correct size bowl.  Other than that, what would be the differance? 

I agree.  My dough hook, whip, paddle, etc. for my newish model fits my old Hobart model, too.  They're exactly the same.  My newish one is a commercial model and Kitchenaid told me I couldn't use attachments like the meat grinder, sausage stuffer, bowls, etc. with it.  Yes, I can and I do.  I think they just want you to buy the new fad-color-of-the-year models.

Kitchenaid ain't what it used to be!