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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.As the baby sitter had chicken pox already, she should not contract it.Again, your daughter is already vaccinated.All those factors will protect her.I feel you should not worry.I hope this information will be helpful.If you have any query, please feel free to ask.If you are happy with my answer please click on the Excellent/Good rating. Wish her healthy life.Regards.