Contrary to Sheilas' nails having remained perfect,is a big fib. A false one had come off and the others weren't exactly perfect as some were jagged. Presumably on her right hand.
Part of her toenail was also missing,and if it tore off,there'd have been blood from that too,as looking at the pics of her feet,her toenails were longer than they should comfortably have been. That toenail was found in the kitchen where she must have received a hard bang to remove the nail,so hurtling around would have caused that.