At the end of Star wars: The Last Jedi, Rey and Kylo together fight 4 Pratorian Guards. After Kylo is taken out, she takes on all 3 red guards left, singlehandedly, by herself. one of the guards is female. Rey is defeated and that's when she fall into the trash compactor.
the whole battle takes place in Snoke's golden throne room. The Praetorian guards are the guardians of Snokes lair.