Hey, she could go broody ut doesnt sound like she is fully comitted or even broody yet....
You will know when you have a broody hen as she will spend most of her time in the nest box even through the day, yelling or growling or even pecking you when you try to take her eggs is a big sign of a broody hen. She will probable sqawk or do deep clucking wen other hens come near her and wen sat on the nest she will puff up to make herself look bigger to deter other chickens that want to lay or come near her. She will want to protect her eggs.
If she is still laying she isnt broody, she will stop laying and sit on the nest only coming out once maybe twice a day to eat, drink and poo.
If you do have these signs then its best to seperate her from other hens give her, her own nest area dark and comfy to minimize stress to the broody. Plus its easier to know what eggs are fresh and what are fertile, as other hens eggs that are layed she may sit on them too!
Many breeders will wait till the hen has been sitting for a weekbefore putting eggs under her.
Another tip is to have a btooder set up with heat lamp incase ur hen decides to reject chicks once hatched... i bought a hen with two chicks and after the long journey she got stressed and rejected her chicks, and i had to run round like a nutter to get everything ready!! So handy to have it just incase.
Always make sure the broody hen is leaving the nest at least once a day to eat and drink as its known for hens to be so dedicated they die on the brood refusing to leave the nest for food and water.
Hope this helps and hope she goes broody for you soon x