I havent used cheat engine in forever so I barely know how to use it but from what I remember it would probably be easiest to find the cell's value when you start a new game and havent bought anything. You can click a couple times and get like 6 cells and then scan again after clicking a couple more times to find the change from 6 to 8 or whatever. At least I would assume trying to do it in the middle of a run when values are constantly changing would be a massive pain in the ass.
she's not really "undead" it's just for some reason the dev used images that were supposed to be based on her being "Contained" by the foundation as part of the evo line (partially Melted with acid strong enough to melt diamonds, cause the actual 682 is basically a homicidal godzilla hellbent on making humanity extinct)