Young Widows often have young children, or you might be a single parent. As the sole surviving parent it is vital that you put Guardians and Trustees in place.
More mature widows and single people have often outlived close relatives which means distant relatives could end up inheriting.
The simple solution is by making a Will you can decide who inherits, instead of it falling into the hands of the State. Pre paid funeral plans are also a very good idea.