The school chapel was built in 1885 and funded by Cecilia Marshall, and the First Mass was celebrated there on 2 July 1896.

In 2018, the school inaugurated its new Upper Sixth (Year 13) Courtyard: new boarding houses area for girls.

It was listed in The Independent's top 100 schools for 2012 based on the most recent A Levels results.

[7] In 2019, girls placed 12th in the Top U.K. Boarding School Ranking based on their 77.1% A*-A results.

As St Mary's is a Catholic school, girls are required to attend chapel and worship services.

All Heads of House have an office in the main body of the school and live on site with their families.

Every house organises activities and social events on the weekends, which parents are encouraged to attend.