You aren´t mentioning any notes, but more what the perfume should evoke regarding emotion.
also it seems the feelings contradict each other a little bit, if I think of the smell of ashes and wind and winter, it should smell cold and wet maybe with a touch of ashes. The smell of a baby is completely different, usually sweet and warm.
I´d recommend trying samples from the Demeter fragrance library and see what you like from there.
There are plenty of perfumes that smell like babies, or winter, or ashes , but all in one might be a challenge.
It might be more helpful if you mention which perfumes your sister already owns.