Does she snore at night or does mouth breathing
at night or whole day???
YOu must see an ent specialist
as planned by you . She needs to get doen X ray of soft tissue Nasopharynx
for adenoids .
Adenoid enlargement is to be ruled out which may block the tube and cause dizziness now and then.
The adenoids if enlarged make the child to breath through mouth as they block the nose.
In doubt do reply