I think in one respect EP acted quite reasonably in allowing DrU to offload after the incident, giving platitudes and then sensibly getting DrU off the premises and home. Sending a quick update before driving home.
Her mistake was not then considering SP or her version of events.
WRT the policy of allowing DrU to use the women’s changing room. Whether or not there is a written policy NC/CE have established that there was a consistent understanding by staff that DrU was allowed in the women’s changing room. Fife are responsible for this - probably IB or HR.