What is the ruling regarding a wife's refusal to be with her husband for more than six months, and is this period considered a constructive divorce?

It is not permissible for a wife to refuse her husband if he calls her to bed without a valid reason, based on the Prophet's (peace be upon him) saying: "If a man calls his wife to his bed and she refuses, and he spends the night angry with her, the angels will curse her until morning."

A wife who withholds herself from her husband without a legitimate شرعي excuse is sinful and disobedient (nashiz), and she is not entitled to maintenance during the period of her disobedience, unless she is pregnant, in which case there is a difference of opinion regarding the obligation of her maintenance.

The wife is not considered divorced merely by her refusal to her husband; divorce is in the hand of the husband and only occurs with an explicit verbal declaration or an implicit statement accompanied by the intention of divorce.