It's hard to tell much from the picture, but the soil looks a little dry. Remember that gravity will pull most water out of reach relatively quickly. On hot days, the topsoil will dry out fast, too. Just make sure she isn't going short on water.
If you insist, a vitamin B complex is always a solid choice; B1, B2, B3, B6, and a dash of C will protect seedlings from stress and improve their overall development. If you're feeling organic, cant go wrong with moringa, it is a nutritional powerhouse, rich in various vitamins, including B1 (thiamin), B2 (riboflavin), B3 (niacin), and B6. It also contains vitamins A, C, and E, as well as minerals like calcium, iron, and potassium. Additionally, moringa provides essential amino acids and antioxidants like quercetin. All the best to you and your wee whipper snapper!