Is it obligatory for a woman to visit her husband's grave immediately after her iddah ends?

A woman's visit to her husband's grave on the day she completes her 'iddah, or before or after it, is not obligatory, as there is no evidence to make it so. Furthermore, it is not obligatory for others, neither men nor women, in principle. The command to visit graves came after a prohibition against it, and a command that follows a prohibition does not imply obligation. Scholars have differed regarding the permissibility of women visiting graves.