Having graduated from the University of Buckingham in 1998 and after successfully passing her Bar examinations in 2000, Marylou was called to the Mauritian Bar in 2000. From there Mrs Subramanien kept a broad practise as a barrister

In 2003, Marylou joined the Attorney-General’s Office as a State Counsel advising the Government and Government Departments in both civil and criminal matters. This involved court appearances where the State or a Government Department was a litigant whilst working under the supervision of the Solicitor General and the Director of Public Prosecution. After a year as State Counsel, Marylou was appointed as District Magistrate in August 2004 sitting successively at the District Courts of the Lower Plaines Wilhems (Rose-Hill), Port-Louis, Upper Plaines Wilhems (Curepipe) and Black River where she acted as Senior District Magistrate undertaking the administration of the Court. As part of her duties as a magistrate she heard and adjudicated upon all criminal, civil and extrajudicial matters within the jurisdiction of the respective courts. In 2010, Mrs Subramanien was promoted to the post of Presiding Magistrate of the Lower Plaines Wilhems District Court, post she left in 2012.

Drawing from her extensive experience she acquired whilst working in the judiciary, Marylou now keeps a broad private practice with an emphasis on civil, industrial and matrimonial matters, drafting civil and commercial contracts whilst advising and giving opinions in commercial matters.

In addition to her practice as a barrister, Marylou has between 2012 and 2015 undertaken academic work as a lecturer and Course Director at The University of Wolverhampton (Mauritius Branch Campus).