Foot stomping is not one of the ways chickens communicate, so I doubt she's doing this to "send a message". A chicken will communicate mainly with their beak, using specific vocals as a close second.
Stomping a foot may mean there's something caked on the foot they find uncomfortable and they will attempt to dislodge it by stomping the foot or shaking it.
It can also mean discomfort from parasites such as scaly leg mites. If you examine the scales on the legs and feet and find they are separating and lifting up instead of being flush with the leg, you can assume leg mites are present and need treating with castor oil or Vaseline.
There is also an outside chance of an injury to the bottom of the foot. Inspect for black scabs and swelling on the pads. If you see any, the feet will need treatment for possible infection from staph bacteria. There can also be a chance of a broken or hanging nail which can be quite painful.