.... after East bid 2N (invitational) South was having a short think about bidding a lead directional 3♦.
West (a LOL - lil ole lady) bid 3N out of rotation BEFORE South made her 3!d bid.
Before the director made it to the table, the 3N bid was undone, South bid 3!d, and West now bid 3!s rather than rebidding 3N.
The director was now asked whether West may substitute her earlier 3N bid with 3♠.
I think Law 31A applies here - "Bid Out of Rotational at RHO's turn".
Is it correct that West may
* repeat her earlier bid (in which case her partner could bid again - not applicable here, but might be on other auctions]
or she may
* substitute her earlier bid with any legal bid (including pass), but her partner is now silenced?
So, for instance, if she bids 3♠ here, then this is where she plays if her oppo don't bid again.
It would have been better of course if the players had called the director to the table at the time of the bid out of turn rather than 2 bids later, but this didn't happen.