It sounds like she has something stuck in her larynx. She's behaving that way, also. You could get a helper and one of you hold her and pry open the beak while the other shines a strong light into her throat. Look at the center of the throat at the back to see if you see any foreign material.
Canker could do it, too. Look for any gummy lesions in the throat and tongue.
Canker could do it, too. Look for any gummy lesions in the throat and tongue.