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I looked on Tokina's website and all I could find was a 28-70 2.8. It has an internal motor so yes it would work just fine on a D40...
If it's a Nikon mount lens, it will "fit" on the D40 and it will probably even be able to meter through the lens, but I doubt it will autofocus with it. Here's a list of lenses that will autofocus with the D40:
Discussion Forums @ Nikonians - D40/D40X/D60 - Fully Compatible AF-Lenses=
Well that would certainly be helpful, if she had a 28-70 2.8.
:thumbup: