Cass, AFAIK berries are a common allergen and shouldn't be introduced until after 12 months. Its something to do with protiens and the immune system but I'm not sure of the exact science. Shannon did a great post about it a while ago but I couldn't find it.
You shouldn't feel bad about not approaching the childcare center to discuss it immediately. I think most of us struggle not to be over-protective of our children and sometimes later we think that we should have raised our concerns on the spot. You need to feel comfortable about your daughter's care so when you drop her off next time maybe you could go in and say that you've thought it over and you're not comfortable with her eating strawberries at her age or having a teddy in the cot.