Talk to General Physician on Pain In Leg

My 3 and half year old daughter is complaining pain in her left leg since yesterday ... Other than she is absolutely fine no flu no temperature... When she sit or lay down for long then she feel it difficult to stretch and move leg but once she starts walking it's OK just a little stretch in leg... Went to doc n he said mascular pain n give pain killer n a gell to massage... She is walking running n even climbe stairs by herself but with little streach. Pain is also not too much .... Plz suggest is it OK or I have to consult some other doctor