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Cool, you wrote it!
Copied from my comment on the previous episode:
"But how would the part about them not being able to put down the bone work? Do they just have to hold it until they either destroy it or devolve all the way back to the species from which that bone came? Or maybe even further, all the way back to something that can't hold the bone anymore?"
The fact that you said the archeologists who found it disappeared is one hint of how far back the devolving goes. (And it definitely makes more sense that any blood on it would come from a previous victim, since blood from the original prehuman would have turned to dust long ago.)
And as for not being able to put it down, you really meant not able to get rid of it, right? That works a lot better.
Also, in the first paragraph, did you mean "for once relaxing" rather than "reacting"?
It wouldn't make a great deal of sense for her to become a dinosaur (even though that'd be cool), since they evolved from a separate branch of the reptile line, but becoming more reptilian in some other way would be reasonable. Or maybe amphibian or fish-like.
Or perhaps she could move slowly backwards through all those forms? Prehuman, primate, early mammal, reptile, amphibian, fish, and so on, all the way back? But maybe she doesn't fully become any of those creatures and is still recognizably human(oid). So perhaps her mind devolves more slowly than her body, so she realizes what's happening to her.
But with each step further she takes from homo sapiens, she loses a bit more humanity? And by the time she got to worms and such, she'd really just be a worm? So the question would be whether the effects could be halted before she got there?
Well, that's what i just came up with on the spot, anyway. No need to make use of that at all. Thanks for posting this.
Oops, oops. That was me.