Nope.Sheila was NOT in full rigor at 03.30 at all. Nobody could have manipulated her arm/hand to the extent that it WAS manipulated if she'd been in full rigor.
There was NO blotchiness that would have indicated Livor and if she'd lain where she was for 6/7 hours,her legs would have been peuce.
Even the blood showed red when it should have been brown,and someone must have closed her eyes,as she wouldn't have done that herself without the reflex action of blinking. They'd have remained open.
You are making contradictory claims, claims that are nonsense and in addition showing you don't even know what the autopsy stated
1) If she had not even been in full rigor at the time of the autopsy then she can't have been in full rigor hours earlier when her arm was moved so your claim makes no sense that it was in full rogr at the time of the photo but not the autopsy. The opposite argument that if she was in full rigor at the time of the autpsy this meant she had to be in full rigor hours earleir doesn't follow either.
2) When someone is in full rigor it is indeed possible to move their joints. Your suggestion such is not possible is not true they do nto harden to the point where they are like stone and can't be moved. Moving joints them causes the rigor to release early. If only partial rigor set in then rigor can set in more and lock it in the new position but might simply stop in that location.
3) At the time her hand was moved for the photo it was 7-8 hours after death so full rigor probably had not set in yet though again it is possible to move an arm that is in full rigor anyway.
4) The autopsy report says she was in full rigor at the time of the autopsy.