What is the ruling on working with a woman in the administrative field, speaking to her about work related matters, and advising her to perform prayers and to wear the Hijaab?

All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.

A man should not work in a mixed environment. However, if he cannot avoid but to work with women in a mixed environment, then he must adhere to the commands of Allaah on him, such as lowering his gaze and not being in seclusion with women unless she happens to be a Mahram.

A man is allowed to speak with his female colleague only when necessary, to discuss work-related matters, or to enjoin her to do a good deed or forbid her from doing evil.

Allaah Knows best.