Makes sense they're trying to frame her. Otherwise if they're actually trying, they'd notice that the wound is 3 scratches but the pitchfork has 4 tines and no blood on it.
Frankly speaking, in the kind of environments they are right now, it basically didn't really matter. All they need is to blame someone that shower likely, even if there's more holes in that accusation that in serie cheese.
What the aristocrats say goes, and truth, justice or rationality don't really matter.
Also, another orgy? People in this world sure seem to like those, not that I can blame them.