MY step-sister is vomiting everything since yesterday?

Helllpp!!
Yesterday she drank some cold water...later she puked everything...and since then she'll puke everything she'll eat or drink...and she's coughing a lot
she's just 4 yrs old and mom's not home...
what should i do?
I bought Motilium from pharmacy...I'm giving her 4 ml...is it good?
 
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