Hello:
Most of illness is viral only, and its required supportive treatment.(It take 4 to 5 days to settle)
You have 
Calpol for 
fever, you can continue with it.
May be in initial stage of AGE(Acute gastro entritis- 
loose motion,
vomiting,fever) Start with fever and vomiting.
You should get her evaluated once for her complaint to get her examined physically by a 
pediatrician,if illness is not recover.
I would advice: 
keep him Hydrate. Is most important condition in illness.
1.Give plenty of water(1/2 liter water+ 4 tsf sugar+ 1/2 tsf salt) Or ORS 
2.Apple juice, Tea, Pomegranate juice, Coconut water, lemon water Butter milk, Rice Kanjee,  etc 
3. Proper hygiene. 
4 Avoid out side food.
Thanks : 
"I Wish She/He will Recover Soon " 
Regards Dr. Sagar Mhatre