Look. A magnifier of some kind helps too. Sometimes you can see just a tiny tag that you can grab with a small tweezer, but don't accidentally pinch their nostril
or you won't be "popular" with your. If you see something but cannot grab it, just leave it (should come out w/ next shed), at least you'll know why the noise, and avoid treating for an R.I. that your snake might not have.
Did she "pass" the "laying flat, not held" test?