Image the card, and don't use it anymore. Working on the image, try using photorec from the testdisk suite. You can get that in the PartedMagic image here...
You can boot to the cd/usb in the first link, and work with the image you created from there. You can also use that cd to create the image using Clonezilla. Again, you want to read the documentation first so bad mistakes don't happen.
If the camera is using PTP instead of presenting the card as USB storage you're probably out of luck with recovery. A discrete reader is your best option by far.
I'm not sure it'll work without a reader, but I've used RescuePRO in the past and it worked great. Nearly every pic was saved from a corrupt CF card, with only a handful of pics distorted after recovery (out of about 350). The free demo will show you if it can recover anything/what it can recover.
Just throwing a positive experience out there if your other options fail.
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