What shall I call you

I thought I would call you flower but would not
Cos flowers loses their vigor in a day
I thought I would call you moon but would not
Cos moon waxes and wanes and never consistent
I thought I would call you river but would not
Cos river changes color as to the soil
I thought I would call you doll but would not
As dolls have no emotions

I think not even for a moment
But would simply call you a sweet girl
With smile that's ever fresh
Brightening days with the bewitching blush
Much enough to give my heart its rush
I wait not t0 rush to see its lush