Leave a kitten outside all night

My mother's neighbour has received a kitten as a gift recently. She isn't her adult size yet but I don't know her age. My neighbour leaves that little thing outside all the time, day, night, rain, sun.... She is alone outside all the time.

My mother and me are feeling sad for her but maybe ar we just two big softies.

Do you think it's OK to lave a kitten/cat outside all the time? (I think she feeds her, that's not the problem)