Wedding Video deleted, can it be repaired from recovery?

Hi

my sister recorded someones wedding and has accidentally deleted the video, I told her not too use the card but she edited a photo and looks as if the photo has been written over the 1.4Gb movie file.

I have recovered the file but it wont play, when recovered using stellar phoenix recovery it plays the photo for 10 seconds.

can anyone help with this please? her friend is breathing down her neck too get the video lol....

thanks