Jesus Christ. First question: me being unable to provide a ‘mechanism’ does not mean something cannot exist. Gravity exists, but we are still unable to fully understand its mechanism. Likewise, universal truths exist. I’m not a philosopher and am not interested in the details of how they exist or what makes them right or wrong, but I do know what is right and what is wrong when I see it.
Second question: yes, both violate a universal right I believe in: the right to life and the right to work.
Third question: they are incomparable situations.
Fourth question: it depends.
Fifth question: the motivation for killing.
Sixth question: of course. I answered this in the first question.
Seventh question: I suppose it would be my conscience.
Eighth question: see first answer.
Pat yourself on the back for sounding smart, but this is a pointless conversation. If you want to continue it then you should send me a PM. I gave OP advice for if she is unwilling to rebel against her family. There are many things she can do before getting married that are cheaper than school, like volunteering and hobbies, that can provide opportunities for the future.