Combat stats (*role-playing game purposes only; most of these are not canon in the novels*)
Primary weapons of choice: Pistols, sub-machine guns, and sawed-off shotguns
Supplements: Grenades, traps, daggers, and switchblades
SMG brand: Franchi LF-57 Italian SMG
Fighting style: Close to mid-range combat. Carmen is agile on her feet and good with melee. She is quite cunning as well in that she is able to set up traps in no time, lock-pick lots of things with 90% success, steal things with ease, as well as charm others to do her bidding.
Weaknesses: Despite her agility, Carmen is a fragile speedster. She is unable to take heavy damage, as bullet-proof vests can sometimes be bulky under her evening gowns. She is also a poor long-range fighter, and has terrible accuracy with ranged weapons. She is easily overpowered by multiple-foes, unless she is able to set up a trap and calculate her explosions correctly beforehand.
Training: During her time in MI6 and the CIA, Carmen attended training camps, military bases, and secret medical facilities throughout the country. She was trained to use explosives, to fight in close quarters combat with improvised weaponry such as a hatpin, and taught about disguise and communications. She learned how to kill with her bare hands, resist pain, and deal with interrogation techniques. She carried and was taught to use a .22-caliber pistol, and was introduced to devices such as a lipstick containing poison. Such instruments of murder could be used to commit suicide, if captured, by biting into the stick. Carmen also learned how code numbers could be painted on her nails, and covered with nail polish.
TL;DR: Carmen is the classic 'rogue' class in a role-playing game setting. Good with speed, close quarters combat, and even way better with passing speech checks...