Is the fiancée required to pay half of the deferred dowry to the suitor if the dowry or any part of it has not been paid, in order to enable her to file for divorce?

If you are divorced before consummation, after a legal contract has been made with you and a dowry specified, you are entitled to half of the named dowry (both the prompt and deferred portions), unless the annulment was due to you, in which case your right to the entire dowry is forfeited. However, if the divorce or khul' (divorce at the wife's instance) comes from the husband, you are entitled to half of the dowry. If you dislike your husband, you may ask him for a divorce or khul', and if he agrees, you are entitled to half of the dowry. Your family has no right to prevent you from seeking khul' as long as you dislike your husband.