I Survived and Came Back to Apocalyptic Earth

Melissa Vince, the Mother who runs the world's most notorious Underground Hitman Organization, suddenly got summoned by God, thrown into a Long and Deadly Battle Royal between 10 People.
The rule is to survive until the age of 30 and compete in the final Deathmatch.
Melissa needs to gain the power to survive this game, she has been thrown into by the whims of the god....but WAIT!!!
"What about my CHILDREN back at EARTH!!!??????" "Why am I in the body of a starving little girl!!??"
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This is the tale of a mother trying to get back to her Children, also...
...what about the Children who's Mother suddenly disappeared?