I find her pattern rather "typical" nothing weird about it to me. and I've never noticed anything different about yellow belly patterns, besides the bellies of corse. also every yellow belly I have seen has been a lighter colored snake
i can tell you its not axanthic, it means lacking yellow pigment and she has plenty of it. adults may brown out, but shes far too young to be already browning out.
if you don't want us to post opinions, then just close the thread. anything we tell you is going to be opinion, we can't tell a snakes DNA from a picture.
but my opinion that im telling you, that comes from my personal experience, there no reason to believe its anything but a dull normal, like the other opinions up there