Such things happened in the lives of many people. Even to find the source of which many people put forward different opinions. But i am limited to the following two issues.
1. By her luck
2. By her hard working
For me?it is my first thought that the money came from Illegal works lol.
Because i know most of the people around me and i also know their capacity,Not unless there are some gamblers involves in this then it may be Luck for gambling.