Short answers, pulled from the story.
Emperor Septimius Severus banned the use of female gladiators from 200 AD onwards according to Dio Cassius. The prohibition targeted higher-status women with personal and family reputations to lose.
Nero ordered Ethiopian women and men to fight at a munus in 66 AD to impress King Tiridates I of Armenia. This event appears as an exotic marker within Roman histories rather than common daily life.
No evidence exists for female gladiators training inside known gladiator schools like the Ludus Magnus. Women attended these schools as wives, partners, or followers known as ludiae.
A marble relief from Halicarnassus shows two fighters named Amazonia and Achillia facing each other. Both wear greaves, loincloths, belts, rectangular shields, daggers, and manica arm protection.
A scholiast writing in the 4th or 5th century first used the word gladiatrix to describe a woman. This writer mocked a woman training for the Floralia festival.