mother superior 

The name of the heroin dealer in the film Trainspotting.

I'm off to see mother superior for a hit.

mother superior by aqua_scummm April 30, 2008

Mother Superior Complex 

A term to describe a cultural phenomenon of female privilege when it comes to child access issues and the many ways having a womb is considered a free pass to act in abhorrent ways - including denying access to fathers. It essentially means that any decision or action taken by a woman is deemed correct and righteous (especially in regards to children) by virtue of having a capacity to give birth. Regardless of how stupid and nonsensical the decision is. It also results in other privileges too, such as reduced jail time.

She has 'mother superior complex".

Mother Superior Complex by @MAVP December 4, 2020