Thanks for posting in HealthCareMagic.
From your mail I presume that your daughter has completed her course of antibiotics for the typhoid
infection and has been afebrile for at least 48-72 hours before your sent her to school.
Yes, post illness a child does become weak and cranky and this irritablity may have resulted in her odd behaviour. However, it is always advisable to discuss with the teacher to know the correct sequence of events. It can be that your child is getting annoyed by the behaviour of others towards her which may have precipitated things.
In this situation it is always better to be patient, listen to your daughter's problems and counsel her accrodingly.
With best wishes,