The woman who became CEO was admired by all. The idea that she suggested ultimately succeeded. The report that she wrote sealed the deal.
Amber affectionately stroked her pet turtle, who curled up in front of the fire.
The child that made the A addressed the class.
These days we never use which to refer to a person. Such usages as “Our Father, which art in heaven” are archaic.
Finally, as noted above, when an inanimate object or abstraction needs to show possession in a clause, we can either use the rather stuffy of which or we can borrow from the personal relative pronouns and use whose:
It was an idea whose time had come.
It was an idea the time of which had come.