Where did the energy come from?

Was wondering why my daughter is so quiet, peeped and saw that she was dancing to this Chinese children song.
I really wonder where she gets the energy from? She's sick but yet she is like a normal healthy child. My ex-colleagues think I have a good time staying at home taking care of her when she's sick, nobody believes me when I tell them she is as active as before.
Anyway, precious daughter loves singing; music and dancing. I have pulled her out from her Tumble Tots class and will enrol her for Yamaha music lesson and another enrichment class.
I saw this Speech & Drama program near my home and will think that's suitable for her.