Why are women not allowed inside the grave

Assalaam alaikum,

Please refer the following links-
Islam Question and Answer - Is it permissible for women to visit a graveyard? (http://www.islam-qa.com/en/ref/251/women%20visiting%20graves)
Islam Question and Answer - Ruling on women visiting graves (http://www.islam-qa.com/en/ref/8198/women%20visiting%20graves)

Wa alaikum salaam