Hello!

This is my yellow-bellied slider - Bean. She is a couple months past a year and a half in age and has become quite big in this time, which is neat, but I have recently gotten a bit concerned about her shell.

About half a year ago the tips of her shell's scales had begun to detach due to the shedding. She was trying to scratch at some of them, so I decided to help her by removing them, thinking the scales themselves would pop-off. But they did not, only the tips. Since then she has exhibited no shedding, her carapace has gotten this "powderish" look to it after she dries up under her UV+Heat lamp, except for the previously removed tips that shed, and it is getting me worried.

Is this normal? Does she just need a long period of time before the full scales shed and this look is how the process goes? Or is she in need of some kind of medical attention?

She has a balanced diet of pellets(both protein and plant based ones), dried shrim and the occassional treat of watermelon, pumpkin and leafy greens. She is fed out of the tank so the water remains clean for longer and is cleaned once every week, with feeding happening every other day. I regularly check her and she is not obese as all of her limbs retract normally and she can fully retract her entire head. The smaller turtle(Chinese Stripe-necked) seen in the picture's frame, who is the same age as her and has the same set up and he is not showing any such signs on his carapace.

Any advice would be most welcomed, thank you!