Welcome to healthcaremagic .
your daughter should be evaluated properly for constipation
.Constipation at this age group commonly due to lack of balanced diet and not taking adequate amount of water /fluid that is required for good health.
Cause of constipation should be found out and treated accordingly.
As the kid having headache,dizziness
,bloody noses ,she should immediately be checked up by e n t surgeon /paeditrician to have a proper diagnosis and treatment.
hope your daughter gets well soon .