I don't know if this is relevant or not, but in the final seconds of the KOAA TV drone video taken after the first search of PF's ranch, there is a corral located well below the dug up area that looks to have a dark circular mark, and about ten feet away is a round metal trough like is described. Perhaps by "scooped up" KKL meant that he picked it up with a loader, and set it in the back of his pickup truck.
If this is the spot she decribed, an open fire could certainly be seen from the porch of the house, but not with any clarity through the trees.
Drone video shows area where investigators searched Frazee property