Dove doing strange neck straining thing

I’m raising a dove for the 4th time and this one is doing a strange neck straining thing especially after it eats. I’ve had her for over a month. I tried bird antibiotics for a week to rule out a crop infection and that’s not helping at all. She bends her head to the side like she’s straining and closes her eyes while it’s happening. Any ideas what this is and how to fix it?