Where should a woman observe her 'iddah if her husband dies while she is at her family's home, having moved from the rented marital home to an incomplete house that she owns?

A woman observes her iddah (waiting period) in her parents' home if her husband died while she was living there, based on Ibn Qudamah's statement: "It is obligatory to observe the iddah in the house where her husband died while she was residing in it."