Nope. It was said that Mags was Finnick's mentor. :)
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District 1: Gloss and Cashmere D2: Brutus and Enobaria D3: Beetee and Wiress D4: Finnick and Mags D5: unknown and unknown D6: Morphling 1 and Morphling 2 D7: Blight and Johanna D8: Woof and Cecelia D9: Unknown and Unknown D10: Unknown and unknown D11: Chaff and Seeder D12: Peeta and Katniss.
Because she realizes that Finnick cannot carry both her and Peeta so she sacrifices herself and walks into a deadly fog.
The Arena's change for every Hunger Games, they vary from forests to practically deserts. The 74th Hunger Games Arena was a giant forest. The 75th Quarter Quell Arena was practically flooded, which made Katniss, The Girl of Fire, uncomfortable.
We will never know for sure as it is never mentioned in the film or book. She was one of the only characters (alongside president Snow) that was alive when the games first started. She won one of the first Hunger Games, but it could be anywhere up to the 13th annual Hunger Games if the rules were the same. She may have hidden like the morphlings or fought, but she would never take part in any of the bloodbaths as she is not built very strongly so she would be dead if she had. She seemed vary clever, almost like Foxface but we naturally warm to her instead of feel Katniss' hostility towards Foxface. It is mentioned that she fights using hooks and awls.
District 1- Cashmere-female Gloss-male District 2- Brutus-male Enobaria-female District 3 Beetee-male Wiress-female District 4 Finnick-male Mags-female District 5 unknown District 6 Morphlings District 7 Blight-male Johanna-female District 8 Woof-male Cecelia-female District 9 unknown District 10 unknown District 11 Chaff-male Seeder-female District 12 Peeta-male Katniss-female