It was the parents she didn’t want to be around? Maybe someone asked her for help so she went into there, maybe asked them if the parents were there before she went?
Letby says: "Don't mind being in [nursery room] 1 but don't want to have [Child B]."
The colleague offers to look after Child B, with Letby also present in the room. Letby agrees and says: "I think it'd be good for you."
She added, in another message: "...I can't look after [Child B] because I just don't know how to feel seeing parents..."
She also wasn't the baby B's designated nurse and was supposed to be in another room looking after 2 other babies. The baby's designated nurse was working - so wouldn't have needed LL to look after her patient. She also took this baby's handover sheet home. Why would she have the sheet if she wasn't the designated nurse and hadn't wanted to look after the baby in the first place?
To me, it seems like setting up the other nurse to be the designated nurse for baby B (that nurse is officially on the records) so in case of problems, the designated nurse would get into trouble. And the designated nurse would be held responsible by the parents.
She managed to swap the designation from her to the other nurse, while still attending to the baby. That makes no sense.
Also the designated nurse would have gotten into trouble over the handover sheet that LL took home. Because it wasn't LL's name on it so no one would have thought she had it.