Here is one I found with good pictures if you scroll down:
https://www.backyardchickens.com/threads/bulge-below-earlobe.950184/
In another thread the chicken was stung by a been in the feed container, and the wattles swelled a turn blue for a few days.
Sorry that I just saw your latest post, but yes, I think that sometimes happens. I recall seeing pictures where one wattle is blue and the other side may be partially blue. I will look for a similar thread with a picture.
This is what a tick bite can do to the wattles. It can be swollen and bluish, where the tick secretes a blood thinner into the tissue, and it becomes swollen and bruised. You could give a small dose of Benadryl to see if it helps the swelling go down. She should eventually get over this and back...