If a Sayyeda girl commits Zina with a non-Syed boy and repents, can they marry later? Are Sayyeds considered superior in Islam or do they have different Sharia laws?
Bismihi ta'āla
Yes, she can marry. Why should she not be able to marry. She did haram, and repented. None of this has anything to do with her being a Seyyidah, and we all know that Islam does not give superiority to any race or group of people or person. The only person that is better than others is he/she with better piety.
And Allah knows best