I know why doesn't she feel sad, 1.because she cry we will very happy. 2.because she isn't worry her marks. 3.she think that her mum will help she,no need to worry and sad.

i know why doesn't she feel sad
because she just can't lose , you two are like playing a competition
she knows that if she cry or sad, she will lose , so she just try don't to be sad or cry

i know the meaning of見到你開心，我都開心....
it's some words that valentences use , it's just like ''i love you''
it's the power of love, it makes you happy when your lover or the person you love is happy
it's just the power of love ----- the nearest thing to magic