I dont think she will marry hamza,track and story from Armaan point will become totally dissociated. it wont make sense.She will return,we have seen so many pics of scenes so how it happens remains to be seen and if it lasts that also remains to be seen.
the fact that hamza didnt fully trust ujala makes me think that he still has some flaws ad hypocricy...after marriage he will start doubting her and think armaan was right about her
he may also turn insecure and posssessive due to her love for armaan which will lead to their break up