How is she growing and developing? It may be that she knows what she needs and this is it
Any history of allergies or intolerances in the family?

Do you *really* feel there is a problem, or are you more concerned what the nurse will say? If the latter, you can either lie or just not go. Sounds like you already know what works for your daughter. If you are concerned, maybe it would be better to seek out a more supportive health carer who you feel comfortable with.