I don't want to make this seem like your overlooking something obvious, but here are some more visual steps that you may have already done...
As noted above, remove the Micro SD card from your
mini 2
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Insert the Micro SD card into an adaptor if needed, You should have gotten one when you bought a memory card
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Install the card into your reader, whether its a slot on your computer or whether your using a USB Card reader like this example
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Once the card is mounted on your computer, navigate to it from the Finder (Mac) or Explorer(Windows) and look for the DCIM folder, under it there is a 100MEDIA folder, and in that folder all the pictures and video you may have taken on a flight will be stored and you can copy them to your computer for editing or archiving.. Once done, as noted, put the card back into your
Mini 2.
This of course all assumes that the picture in question was not previously deleted from your card manually or by erasing the card.
Hope this helps..