Regarding presence of women of general officers on the battlefield, it is not completely impossible, Louise of Prusse was nearly captured by French Hussars after Iena.
But regarding Bonaparte, I do not know any evidence of any woman with his headquarter on the battlefield. Battles were at short range in this time, and even the rear could risk a sudden cavalry attack or an artillery fire.
Women of general officers could travel with the army, like the mistress of Masséna in Portugal (to the great displeasure of the army, who resented her as a limitation to the general's activity); or the wife of Suchet, present at the siege of Valencia. But they were not involved in the fight.
Some women could join after the battle, to attend their wounded husband, like Magdalene de Lancey at Waterloo.
They could more usually follow the army in campaign, like Josephine coming to Piedmont in 1796 : Bonaparte wanted her close to him, but in a safe city - although she was nearly captured in Brescia and had to escape under Austrian fire.