The charge should be there, unless the PO has already been tried summarily by the CO on a lesser charge (I assume the PO was not doing Jackie Chan impersonations). The charge should be failing to carry out the duties of a Senior Rate (the ones that were on the back of her promotion certificate, in case she was unsure) - despite there being an hofficer there, as the hofficer in question was clearly incapable of carrying her handbag, let alone her rank. The PO should be disrated, although I suspect this didn't happen, and is more likely to be a fine and a period of unofficial monitoring.
Sordid little situation that should have been kicked into touch when you consider the seniorities involved. Then again, scrub that, as we all know of situations like this which have not been CCTV-monitored, and have never made it past the unofficial divisional chat the next morning, which involve ranks of all seniorities!