TL;DR: We have no idea, but if her powers come from something that can be handed over then she could telling the truth about how she got them.
Goldrush is a fairly recent addition to the DC Universe, and we know next to nothing about her. She was invited to become a reserve JLA member by Cyborg. Since her introduction, though, we have yet to see an origin story for her or even an explanation of her powers. To date (July 2015), she hasn't been seen since the five-issue arc that introduced her.
What we do know is that she appears to be from Texas and has the ability to cover herself in an organic alloy that resembles gold. Similar to Colossus of Marvel's X-Men, this covering grants her increased strength and a degree of invulnerability. The covering can apparently be activated or deactivated at will, and automatically deactivates when she is knocked unconscious.
If her abilities turn out to be based on technology, a chemical formula, or an alien artifact (virtually anything that could be handed over to someone else), then it could indeed be something she won in a divorce.