The wing tipping is a dominance show thing, mostly associated with roosters but I have seen hens do it, though rarely. The noise over food is one we hear a lot of from the broodies, it is like a 'pook, pook, pook, took, took, took'.... with pitch, speed and intensity changing based on how good the treats are that they found. BOs are known to be broody types so it wouldn't surprise me to hear of her taking youngsters under her wing. If she does you will be a happy camper, because it will give the newbies a great 'in' for the rest of the flock to have a hen babysitting them.
I'm not sure about her not laying, could be 2 or 3 things
.... check her feathers for signs of molting, some birds do spring molt and it would cause her to stop laying
.... check her underside below the vent for signs of distention to see if she could be internally laying
.... check her chest to see if she has begun plucking a broody patch, she may be in the beginning stages of going broody, stick a medium dog crate into a corner of the coop somewhere or fix up a floor nest somewhere with some fake eggs in it and show her... she may decide she wants to set.
We have multiple roosters, and they wing tip each other frequently (except the lowest 2, they would get beat up if they try!)