The likelihood is them taking down a medical history and probably repeating the test she has done prior and going from there.
My son had to have a second test as he failed the first (due to his breathing being too loud rather than him not having clear hearing). It was a more in depth test with sensors on his body/head (I can’t remember where they were stuck now..). He didn’t mind it at all
I experienced the exact same with my baby. I was reassured the unclear reading is likely the mucus blocking it. The audiology appointment is pretty quick, it’s better if you put baby to sleep because it’s not invasive at all. They stick an earphone bud looking thing into baby’s ear. Baby and I were in and out within 10mins. All the best