She should be doing the egg squat by now, walk up to her tomorrow and scratch her shoulders between her wings. If she squats down with her wings out and stays still until you walk away you've got a little gal. :)
I don't see anything that remotely looks roostery. The comb on females starts developing at that age. She looks very close to laying judging by how red and full her comb and wattles are. Get a nest box ready. :) Oh and the behaviors you mention are all normal posturing as they work on...