A quote from the judge in his summing up. Copied from the COA -
"Then another point is that when she was found, there was no blood marks on her feet – on the soles of her feet.
Well, you may think that is a matter of considerable importance because she had been involved in the fighting with her father as well as killing her mother, surely it is inconceivable that her feet would have been clean in the way that they were found to be, and in the way you see them to be clean from the photograph.
What is suggested on behalf of the Defence is that after killing, at any rate, the father and the mother, she went and washed; and tied up with that piece of evidence is the fact that there were no marks of lead on her hands."
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What is interesting here is the jury were shown pictures of Sheila's feet. I suspect this included the same picture which surfaced in the media a few years ago. Which just shows a bit of redness, perhaps due to recent digital enhancement.