Her research interests include Political Islam, sectarianism, and the intertwining nature of religion and politics in the Middle East. She has presented at the Centre for Middle Eastern Studies at Harvard University, examining Saudi clerics and Sunni-Shia relations in the Middle East, the Crawford Australian Leadership forum 'Global Realities', discussing challenges and opportunities for the Middle East, the Canberra Writers Festival, examining the geopolitics of the Middle East, as well as other academic and non-academic events. She delivered the 8th Hancock lecture for the Australian Academy of the Humanities, titled "Hybrid Civilisation or the Clash of Civilisations: Rethinking the Muslim Other".

Raihan is the convenor of the Political Islam seminar series for various Commonwealth government agencies, including AGD and Defence. She is a regular commentator in Australian and international media on Islam and Middle East politics and appeared as a panelist on the ABC's Q&A program in 2016. In 2019, she was placed in the ABC’s Top 5 Media Residency Program for humanities scholars.

She has published in academic and non-academic outlets including the Washington Post. She is the author of Saudi Clerics and Shia Islam, published by Oxford University Press in 2016. She has completed a book project titled Rethinking Salafism, which looks at the transnational networks of Salafi clerics in Egypt, Kuwait and Saudi Arabia. The book is scheduled for publication later in 2021 through Oxford University Press.

She has a Bachelors Degree in Political Science, with a minor in Islamic Studies, a Masters in International Relations from the International Islamic University of Malaysia, and a PhD from the ANU.