Her responses are really odd imo.
The comment about the bag of fluid being 'not what we thought it was' - why would she come to that conclusion? Why suspect the fluids of causing the rash rather than some other medical problem? A medical explanation would be more likely than a contaminated bag, surely?
She claims to have asked to check the bags, but there's no record of her making that request and none of the staff remember her asking questions about it. If she believed the bag's contents were making a baby seriously ill, this would be a matter of urgency, not something you'd forget about when your shift ends.