Review of The Mistress Always Spanks Twice

I enjoyed this episode, but later realised a huge plot hole. Spoiler Alert : at the start the body is hanging from railing, and tracks show a wheel suitcase was used to transport it there. At no point was the suitcase every mentioned again or looked for in any of the suspects houses. Also at no point did anyone suggest how strong the killer had to be to be able to lift the body to be hung from the railing. So when the killer is finally revealed, she is quite small and highly unlikely to have been able to hung the body up.