The challenge here is that there is very little written either by the women camp followers about themselves or by other people. Camp followers played very important roles. They cooked food, cleaned and fixed clothes, nursed the sick. Some were engaged in the sex trade. Many were "married" to a soldier in some sense, some brought children as they moved about. Several disguised themselves as men so that they could fight as soldiers.

Estimates of the number of camp followers vary, but it can be about as many as, or more numerous than, the soldiers themselves. Cavalry units had a high number of camp followers which makes some sense because they needed extra workers for their horses and equipment, and the soldiers tended to come from higher social strata and had more money.

The treatment of camp followers varied depending on circumstances. It was accepted they were a necessary part of an army in that era. But they could and did slow down the movement of the army. There are instances where they were abandoned or even ran off a bridge to make way for the army.

Women, Armies and Warfare in Early Modern Europe by John Lynn covers this in great detail. Also check out Furies by Lauro Martines, The Business of War by Parrott.

While women could not become officers in armies, some did rise to prominent positions, for example the two Habsburg regents of theMow Countries: Mary of Hungary and Margaret of Austria.

Finally, there are also outstanding examples like Theresa of Avila. She became advisor to rulers of Spain and was very influential.

So this is a really big topic and you need to tell us at what level you are interested in learning, or specific subtopics.