as salam alaikum
if the environment at the stadium is corruptive or immoral, it is not permissible to attend matches or gatherings, regardless being man or woman. Fans' claims and feelings of superiority, clashes, loosing one's own control, promiscuity, alcoholism, forbidden looks, etc., are often a constant in certain stadiums and promoted by certain factions. That is not appropriate for a Muslim to witness and it should be avoided.
With prayers for your success.