Is a fiancée's prayer invalid due to her engagement?

The forbidden relationship with the young man must be severed immediately. Do not be deceived by his outward show of piety, for many immoral individuals feign righteousness to achieve their aims. The prayer of a disobedient person is valid if performed with its pillars and conditions, and it is not invalidated by sin. It is not permissible to abandon prayer on the pretext of disobedience.