rough skin?...

[Maleko]

I picked up my puget sound garter snake this evening and noticed that her underbelly had an abrasive texture to it. There are patches of discolored dry skin. There have been no changes in her environment, and she lives on coconut shavings. She's about 9 months old and to my knowledge has not shed yet. I purchased her at 4 months and the breeder had said she had not shed. I know people say that she'll shed when she needs to but this can't be normal can it?...