It depends on who the regent is. If it's the Queen things may proceed like OTL till the mob comes for her at Versailles. She would've ordered the Swiss Guard to open fire, to save themselves, or at least giving her the chance to escape with her children. A monarch at liberty would've had a better chance of rallying counter revolutionary forces. There was strong support for the monarchy in many parts of the country, but with the royal family under virtual arrest in Paris mobilizing it was much harder. The hapless Louis XVI never wanted his nation to face civil war, Marie was made of sterner stuff. The loyalty of the Army would have been critical. Most of the rank, and file may have hated the "Austrian", but loyalty to the Dauphin, was still strong. Civil war is always problematic, so who knows what would've happened.