Bloodstains on carpets...
well the stain is very likely to be impossible to remove if its had enough time to dry....
but if its wet then chances are the stain can be cleaned up ...leaving very little or no easily visible traces..
so if Sheila died about 3.00 am or before ..no chance of cleaning bloody footprints made by her on carpet..if any were on a piece of carpet.
however if she died about 8.00 am ish and people are on hand to take photographs quickly they can be taken and the carpet then cleaned as long as they dont mess about wasting time ..get it wet and scrub away...key is not to let the bloodstain dry out.