Is the waiting period (iddah) obligatory for a divorced woman if her husband did not consummate the marriage, and the lawful seclusion (al-khalwah al-shar'iyyah) was limited to kissing and embracing in the wife's parents' home, with the door not entirely closed?

If the seclusion between the engaged couple takes place in a location where they cannot be certain that no one will enter upon them, then it is not considered a lawful seclusion (khalwa shar'iyya), and the rulings pertaining to consummation, such as the obligation of the iddah (waiting period), do not apply. In this case, there is no harm in accepting the engagement.