Oh, I was going to try one on my D50, but it doesn't matter. As long as she can get the data onto her laptop in Aus, all's well. If she can use them on her D90, then that's a bonus.
In a spare moment, I opened several other forums about the D90's use of SD cards. Finally, I got the Nikon site and the specific question picked. It showed their official page with, No longer supported kind of message in the middle of a large important-looking blank space.
The forum folk seem to say the reason the 16Gig card is shown as not suitable in Nikon D90 bumph, is simply because Nikon have never tried that type. Numerous folk say they run 16s, so decided to go for that. 32, is getting unmanageably large for day to day use where still photos is the main usage.
Just phoned London Camera Exchange in Colchester. Without a second's hesitation, he said the 16 will work just fine. Sometimes, I like people to hesitate before answering.
The next thing is, to format or not to format. Does one have to format specifically for computer use and then reformat in the camera?
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I know I edited.