A girl wearing a knit cap, gloves, winter jacket, snow pants and boots stands by a frozen waterfall, with a metal pole by her side.
A young girl is by a waterfall.
A girl should be young and so young girl as she stands by a (frozen) waterfall.
If a girl is wearing a knit cap, gloves, winter jacket snow pants and boots has a metal pole by her side and is standing next to a waterfall it implies that she skied down the mountain to the waterfall.
stands by a frozen waterfall is inferred as A young girl is by a waterfall.