Let us not assume that Sheila walked into mother's bedroom after shootings.
I'd have to recheck the layout of the house, but for all we know Sheila may have moved into that bedroom to discover what the commotion (shooting) was... and entered by the other door (close to where she was found) in which case - there'd be no blood.
It's also possible that a number of people were woken up by movement in the house (or not even asleep).
I think however that it's 'reasonable' to expect very small traces of blood on her feet had she walked around the house having shot people.
However, with a carpeted surface, it's quite possible to stand on a spot of blood and it be wiped off (as a matter of course during movement). So - forensic inspection might reveal blood, but visual inspection not. We are not talking pools of blood (for the large part), but splashes in SOME areas.
Certainly soles of the feet with blood would indicate treading in blood, but at the top of the feet, either spillage of her own blood or spatter from a victim.
Here is my theory:
1) If you shoot somebody no blood will appear on the soles of your feet (they're touching the ground), but it's reasonably likely you may get splatter from the victim falling on them.
2) If the spatter distribution is wide enough you 'might' tread in some as you walk away from the victim (but from the limited photographic evidence on here, the spatter wasn't particularly over a wide area)
3) Even IF you trod in some, it would not be a pool of blood, but a number of droplets, which, having walked further over clean carpet is highly likely to wipe off the sole (trace elements my be found, but visually remain clean).
4) There's no particular evidence to suggest that the killer had reason to return to the vacinity of a victim (thus treading in their blood) - they might well (and quite probably would) have moved away from the victim and onto the next. Thus minimising (unintentionally) the possibility of blood on the soles.
Indeed, regardless of the identity of the killer (Jeremy or Sheila) IF one argues that you'd expect to see blood on the soles, then one must logically conclude you'd expect to see bloodied footprint traces also.
I do not (to my knowledge) know of any such findings.
