I had situation today very upsetting to me and can use some advice. I am an RN in a rehab center was caring for elderly lady s/p fx ankle with surgical repair. She was experiencing major constipation issues. Gave her mom in am no relief then toward end of my shift gave dulce lax supp at approx 2:45 she was calling down hall for bed pan no CNAs around so I went in placed her on pan went back 10 min later she said needed more time so I gave her call bell went in hall spoke to CNA in hall told patient on bedpan he said okay. Then I went to dining area getting ready to leave unit to give report to oncoming shift told second CNA I had put pt on pan and she requested more time and she had her call light CNA said yeah that lady takes along time on pan and said okay. I went gave report to oncoming nurse told her had given supp put her on pan and she was still on and to check with CNAs if had results cause if none would need enema. Approx 2 hours later I receive call at home guest was still on bed pan and had red marks on her bottom. I said to nurse I told 2 CNAs both CNAs denied me telling them and nurse vaguely recalled our conversation. I feel scapegoated they obviously forgot to check and don't want to get in trouble but I feel awful for guest and feel I will take blame cause I placed her on pan. I am a wreck over this any advice.