Dry skin - doesn't look like typical shedding

[snickersnake]

Hi all,

Lucy (my garter - I've had her since she was a baby, 3.5 years ago) has what looks like dry skin. A few weeks ago, the top of her head looked dry and I expected that she was starting a shed. Usually, she soaks in her water bowl and within a weeks or so, she looks very dull all over, then her eyes turn blue and she sheds beautifully - always in one piece. But this is different.

Her body looks like it has dry skin. It does look dull but it also looks crumbly, flaky. Other than that, she seems fine. She's eating great. I attached a few pictures. It's a little hard to see, you have to look closely. It looks like dry skin - speckly white all over her. With the picture of her face, you can see that it starts on the back of her head.

Thanks (in advance) for all your help.