Hello I just found this forum and it's amazing. I was hoping someone could look at my

and let me know what they think? I have had her for a little while, but she's actually 18 years old. Previously she was with an owner that didn't bother to have a UVB bulb replaced after it burnt out. She was also just eating purely protein (feeder fish and dried insects). Now she eats turtle bites and sometimes snails/shrimp/feeder fish. I've had a very hard time getting her to eat veggies/plants. Also, I didn't have a very good setup when I first got her. The water was cloudy as I didn't have a big enough filter.
I think she needs to shed (also has pyramiding especially on the 2 scutes closest to her head) but I've never seen this before so I'm not sure if it's really happening. There are a few small pieces on the outer part of her shell that are starting to come off. They look like a thin transparent sheet. There are also other things about her shell that I worry about, but I'll just let you see below. Thanks so much for any help!