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Greetings,Thank you for your question. I am Dr. Su S. and I will try my best to help you.I am sorry for his condition.The risk of Reye's syndrome is there but it is rare in this situation.However, he needs to avoid contact with his sister.Risk of Reye's is increased in case of viral infection.
It can be mild cold from other virus not flu.
Fever may be absent.
As she had flu shot, flu should not occur.
Please keep her well hydrated.
Room can be kept humidified.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.