Five minutes is a death sentence. She might swim away after a while but she'll be found belly up on someone's beach a few hours later. I don't want to sound like a nag here but once you bring the fish to the boat, leave it in the pen net. Remove the hooks while the fish is in the net and in the water. If you need a pic of the fish, make sure the camera(s) is ready and then commit to taking it out for the pic. Don't pussyfoot around, grab the fish properly. As you pull the fish out of the water, hold your breath....when you can no longer hold your breath, that fish needs to go back in. Once in the water, hold it by the tail with your other hand under the belly to keep it upright. Don't move it back and forth, just hold it there. You'll feel the strength return to the fish and they should swim off strongly.
Just sayin'.