Your effort allready is respected, I know a lot of guys who would have shirked allready..Those swamps are tough,, and it has rained.But keep the drive....As for the lab,, Take a piece of deer, fresh meat preferably, or a pinch of the dirt (I use a tarsal gland on bucks)where the blood was or from the scrape, or both and let the dog smell it then pretend to throw it .. If there is scent and she is a good retriever this will incite her drive to hunt.. that is how my Chessie works deer and hogs.Gotta kinda tease them into working a smell they are not trained on. I am betting she knows exactly which direction the buck followed after the blood she just doesn't understand that you want her to follow that..Seems kinda quirky but is has worked more often than not... Good Luck.