I doubt that she will file for divorce, as it is probably more to her favor to remain married to you as long as she possibly can. The separation seems likely create issues with trying to remove conditions from her Green Card, although... there is always the possibility that she will claim domestic violence to try to get around that problem. And yes, if you choose to remain married, you open up the possibility that assets you continue to accrue will be treated as marital assets in a divorce.

