why does my daughter always whine and moan?

my daughter has always been headstrong but listened to what i said. now for the last week or so she has been constantly whinging about everything! she has major tantrums over silly things that wouldnt normally botheer her. She isnt a horrible girl, she is kind, considerate, loving and a good sister and nothing has happened in this last week or so to make her change but shes just become some so difficult at the moment, what should i do? Shes 3 years old
can i just have constructive answers.
 
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