Can't tell. They're the oddly black coloured things on her belly. I am worried it's YF, though I've never really seen it affect only one scale at a time? It seems like she has a few odd dark coloured scales on her belly. (I'm not talking about the faint stress marks, but rather the much darker coloured sporadically placed dark 'dots'.)
All is fine otherwise. About 18 inches long and about 430g? (Is this a healthy weight?)
Those strange darker spots on the belly are just unshed scales. They can get those on their
belly & for some reason they take forever to shed off. It definitely isn't yellow fungus though.
Your dragon's scales look very healthy to me.
The length & weight look good as well. She will likely fill out a little more also, into her second
year & probably a little more length too.