hmm... if lightroom copied the images, it would have taken the reference from the new location rather than showing the 'missing' notification, no?
>TS - you mean u actually loaded the contents of your SD card DIRECTLY into lightroom without copying them first into the computer?
chances are that the changes you did to the images in lightroom would have been lost even if you can recover the images using software.
best solution for you is to try to recover the images using recovery software, copy them into the comp, then load them into lightroom again from your comp and not the SD card.