bathing illustrations and ritual purification

[-JKP-]

I can't decide if the thing in her hand is calipers (for measuring), forceps (for yanking out a baby), tongs (for picking up or grasping things), a compass (for making circles or measuring), or something else...

Forceps can be ruled out, based on their too recent invention You are not allowed to view links. Register or Login to view..
Based on the shape alone, I'd say calipers are a possibility. If the fight is supposed to symbolize a territorial struggle (which I believe), then this would also make sense.
The images of compasses I've found are all straight legged.
Tongs are a possibility, although I'd expect more of a handle to them to provide better grip, like these (just a random example to show what I mean)


So out of the options you list, I'd choose calipers.

They had forceps by the end of the 16th century so chances are they had them earlier.

If I recall, they were more for removing dead babies than live ones but... who knows... it's not a subject most people were permitted to talk about.