Any marked change in a person's behaviour warrants a deeper look. Laughter at inappropriate times can be a stress reaction - some people cry, others laugh. Is your behaviour the same at home as it is at school? Has her OT noticed any changes? If her school has a guidance counsellor (who has a psychology background) it may be worthwhile letting your daughter spend a bit of time with her; if this is not possible a play therapist or psychologist may be necessary. Schools, unfortunately, tend to be very quick to suggest medication; something may be upsetting your child or she may just be going through a phase. A good place to start would be to chat to your daughter and ask her why she is behaving the way she is. Sometimes children just need an opening to talk about something.
All the best,
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