giradman and X-ray eyes - a delay in the notifying post getting to me or me not in tune with the new site methods, sorry. I am grateful for your attempts to help.
She was using the SD adapter, which she has used a couple of times. She knows about the 'delete' button and download sequence, including the option to keep or delete the card, but swears she did not see a 'delete' or any warning.
As this was right after the holiday this was our first load of pictures, so nothing was synced to the iMAc, we would have done that after downloading the pics. In line with Murphy's First Law of Events what she lost was the whole set of pics for the best day of our trip as far as she as concerned.
I have tried the card on the iMac and it is definitely blank for the lost pics. AFAIK on the iPod 'Delete means Delete' so there is no Disc Rescue or view of the Trash to go through.
Well - not necessarily, i.e. when files are 'deleted' from a storage device (e.g. hard drive, SD card, etc.) in the standard fashion, the 'markers' to their location are freed up for new use but the data is not erased, thus may still be recovered. The first step is NOT to use the SD card if you want to attempt recovery of the pics (the lost data can be over-written).
Google 'SD Photo Recovery' - there will be plenty of hits, such as
HERE - these programs may be free, may be free to examine but not recover data, or may be VERY expensive - you might want to give one a try if the images are really important to you.
NOW - to date, I've not used recovery software on any of my storage devices (and have been computing since 1980), so not recommending any specific program. Let us know what happens - this question does arise occasionally. Dave