Is this a good diet for a baby guinea pig?

I just got my guinea pig yesterday, and she has been eating her food, veggies, and drinking her water. Her main food source is Timothy hay pellets, made by kaytee. I put oasis vitamin c drops in her water, which I will do until she starts eating her veggies. Today she nibbled on a red bell pepper slice, and had a few sprigs of parsley. She also nibbled on a vitamin c treat I bought her at petco(made my ecotrition) she also has some wooden chews and all the Timothy hay she can eat. Is there any particular thing she needs in her diet, or anything I need to out in her cage other than her igloo, food bowl, water bottle, hay, chews, and kabob? Thanks!!