Yeah, I’m lost myself on what exactly she did to him.
That’s not to say I don’t believe that she killed him (I absolutely do), but this whole thing is incredibly odd (limited time in broad daylight).
I guess it’s possible that she went out and dug a grave on Sunday night, but that may be very difficult, if not impossible.
And it still doesn’t answer the question of how she killed him.
It's possible he may have died unexpectedly due to internal bleeding. She panicked, put him in a heavy trash bag, or suitcase, or some other container, and in a dumpster.
I get the feeling she has enough rage, anger, and resentment to do just that, then walk away saying to herself how glad she is that THAT problem has been taken care of.
I've also thought she abandoned him, while he was alive, but mortally wounded, and he stumbled around and then walked off several hundred yards, more or less, laid down and died, to be found near one of the search sites. The reason I say this is, the 105 search site involved a rather large area, a lot of it being on the other side of wire fencing, as though there was a good bit of movement by whoever was leaving evidence.
Lastly, she may have done a quick burial, in some softer, loamy, soil, in a wooded area, or simply covered him in a depression, with logs, branches, needles, and leaves.