Nobody has answered the Point
What SHOULD the Guard have done with the girl in those circumstances ???
Gently led her away from the train and sat her down before signalling the train aw. He was under no obligation to do anything other than that. I've seen guards do this on my local line - if the drunks turn stroppy they are under instructions to ring the police (they all have company mobiles)
The Guard stated she had already walked away from the train and then returned the next time he looked
by leading her away he would have made himself TOTALLY responsible for her and her further actions, as she was "non compos mentis" and there were no Platform Staff to look after her,
Calling the Police could have involved a very long wait at that time of night, (I`m not sure there are Transport Police on every station late at night) which would have delayed the train, with a "knock on" effect to other passengers and delays backing up with other trains, which would not have gone well with his superiors
By leaving her on her own on a seat in a drunken/drugged stupor would be potentially dangerous and possibly life threatening, and once again the blame would be put on the Guard.
Sadly due to the girls actions, the Guard was placed in an unenviable position where he was going to take the blame whatever he did.
