It's on Sheet 24 here: http://jeremybamberforum.co.uk/index.php/topic,1932.msg59875.html#msg59875
It could be that I am missing the point, but what she says makes no sense to me. I agree that wearing gloves may obscure fingerprints, but there's an easy solution to that: A dead person still has fingerprints. When 'Matthew' - i.e. Jeremy - was carrying out this killing, at the least all he needed to do was put Sheila's prints on the rifle when placing the rifle on her body. Why should it make any difference what happens in the struggle with Nevill? And why would Sheila's prints be of relevance at that point, if this whole thing was staged?
For me, the real issue is the absence of more of Jeremy's prints. I find that suspicious because Jeremy was a manual worker on a farm during all weathers, including hot weather, and used the rifle regularly. If Jeremy is innocent, his prints should be there, along with Sheila's, with perhaps lots of smudged prints. On the other hand, if Jeremy is guilty, then his prints would not be there, because he wiped the rifle, either intentionally before placing the rifle on Sheila's body, or inadvertently by using gloves (as, I think, Julie is describing). The problem there, though, is that if Jeremy wipes the rifle intentionally, he must then leave Sheila's prints on the mechanism, action and barrel, yet we find only one clear print, which is on the stock. Equally, if Jeremy simply relies on gloves and there are no blood prints, then Jeremy's thinking as described by Julie still make no sense, as explained above. In either scenario, surely he goes to some effort to place Sheila's prints on the rifle?
Incidentally, going back to Julie, I am assuming that no glove was found? I recall no mention of one. If so, then 'Matthew' (Jeremy) must be assumed to have recovered it and replaced it on his hand, which means that this detail is only Julie's assertion.