Both SD cards work when I use a USB card reader in the USB port. I noticed that the card she was using is thinner that the ones I have.
Are you sure that both are SD cards? If I recall correctly, MMC cards (which are what my last phone used, until I lost it, which is why I'm not sure) are physically quite similar to SD cards,
Well, I have just checked and you are right, it says "multimediacard" on it in small print, didn't notice as I didn't have my glasses on.
if somewhat thinner. Their electrical contacts are very similar too, if not compatible.
And yes, the SD and the MMC card both work in her camera, so I have replaced her MMC card with an SD card, which work for the camera and the Elonex One t.
Surprising, but true, you can learn something new everyday.
Regards
Janet