Hello,
I understand your concern; however, it may not be possible to avoid an illness in children as their hygiene at age two is marginal.
It is your personal decision; however, it would now be safe for her to return to daycare. The incubation period (the time between infection and the onset of symptoms) for most coxsackie virus infections is about 2 to 10 days. It appears you have kept her home for the interim in which she may have contracted the virus.
The school made a valid point, if she unfortunately was exposed, she will get it whether you keep her isolated or not.
Here is some info, please let me know if you have any further questions:
http://www.kidshealth.org/parent/infections/bacterial_viral/coxsackie.html
Here is some info you mau find helpful, please let me
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