You arenīt 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.
Iīd 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.