Should a girl who doubts her faith and performs acts of worship choose to study in a religious branch or a scientific branch, given her desire to study sciences?

Studying the Islamic sciences is not an individual obligation (fard al-ayn) except to the extent that it rectifies the obligatory acts of worship. Learning the details beyond that falls under communal obligations (furood al-kifayat). Enrolling in a Sharia-specialized program is not obligatory, but it is preferable due to the scarcity of specialists. Studying in mixed-gender universities is not permissible except out of extreme necessity and the absence of an alternative, while adhering to Sharia-compliant guidelines to avoid corruption.