Redness? It could have been a reaction to the copious amounts of narcotics she imbibed of the course of the evening.
It could have been from her attacks on Hardy.
Hell it could have been her beating her own chest like a coked up crazy person in the throes of grief after being dumped.
In a court of law, that's called reasonable doubt.
or even if Greg tried to restrain her, some people bruise real easy especially on drugs and alcohol