The player I spoke with yesterday thinks that the ref initially went to book Greenwood not realising she already had done, but as she's already made the move to get the card out, had to follow through with it to save face. (I don't personally agree with this view cos it doesn't explain the rest).
The club are fuming, particularly with her walking off the pitch and down the tunnel smirking. The dressing room was in shock at her 'performance'. Chelsea players and staff were also baffled but Emma Hayes has come out afterwards and said different, which hasn't gone down too well either.