Red Eared Sliders Shell Pyramiding?

I have a female RES that is about 3 inches in length. I think it is starting to get a pyramid shell. I have looked up pictures but i cant tell if its got it or not. Are thertr shells supposed to be perfectally smooth? Mine has slight bumps and a ridge. Is this normal for females? Also I have reptomin pellets and krill. Can someone give me good amounts of food to feed it each day? Thanks for answering!

Red Eared Sliders Shell Pyramiding?
i cant explane pyramid but the bumbs maby its sheding



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