I would stop offering all treats immediately until you find out exactly what this particular bird's problem is.
If it if it takes a knee cropsey to find out the problem.
Overfeeding treats is extremely common and easy to do.
When birds do not get a complete balanced diet you are much more...
It's anyone's guess as to which reproduction tract problem she has but if you would like to learn about each start reading here...
https://www.merckvetmanual.com/poultry/disorders-of-the-reproductive-system