Welcome!
As an "old hand"
with some 2yrs of chicken experience, I can tell you not only do pullets chestbump & fight like boys, but some hens continue the behavior.
Not only do my hens still sometimes challenge each other, but I've seen them smackdown my teen rooster the same way.
If he doesn't mind his Ps & Qs to their liking, they will not hesitate to push him out of the way, and give his wattles a good pinch too!
Keep your eye on your suspect chicks for signs like:
-a more upright stance
-thicker legs
-pointy-ended hackle feathers
All signs of a roo-2-Be
As an "old hand"

Not only do my hens still sometimes challenge each other, but I've seen them smackdown my teen rooster the same way.
If he doesn't mind his Ps & Qs to their liking, they will not hesitate to push him out of the way, and give his wattles a good pinch too!
Keep your eye on your suspect chicks for signs like:
-a more upright stance
-thicker legs
-pointy-ended hackle feathers
All signs of a roo-2-Be
