My 25Lb dog ate these chocolate wafers I got from Iceland

I don’t know how many she had but my parents think it’s no cause for concern but I am concerned. I’m thinking she ate 3? Maybe 4? I’m super worried and my parents just want to wait to see if she has any symptoms. The box is 250 grams and there is about 15-20 pieces in there. 250g=8.818 oz / ~18 pieces ≈0.5. So maybe 0.5 ounces of chocolate per piece?

She’s a mini Aussie.

Any advice 😭