Do your best. Catch her after dark and examine her for signs of a respiratory infection. Check eyes, ears, nostrils, mouth, choanal slit, and glottis for abnormalities like mucus, excess saliva, pus.
Choanal slit View attachment 1978465
Glottis
View attachment 1978466
Also listen carefully for wheezing, rales, etc.
Do her pics look ok to you? I didn't see or hear anything abnormal, the only thing I noticed is her crop should have been fuller but before roosting her eyes were not clear so she didn't eat as much as she should have.