Will a girl be sinful if she works 12 hours a day and cannot perform her prayers except at night, knowing that she needs to work and has no possibility of performing prayers on time at work?

Delaying prayer beyond its prescribed time without a legitimate Shar'i excuse, such as being preoccupied with work, is considered among the major sins. The questioner must repent and commit to performing prayers on time, and seek a job that allows her to pray. If she cannot find such a job and is in need of employment, then it is permissible for her to combine prayers (Dhuhr and Asr, Maghrib and Isha) either by advancing or delaying them when there is hardship, based on the opinion of the Hanbalis. However, if the workplace completely prevents her from praying, then she must leave this job, for Allah will provide for her from where she does not expect.