From what you know about liza, what is the most likely reasons she is making such a big deal about finding out what is properly hers?

If I understand you correctly, you are talking about the  fourth act of play by George Bernard Shaw. In that case, even though you didn’t attach the options to give you the right answer, I have the correct one. I am pretty sure that the most likely reason Liza is making such a big deal about finding out what is properly hers is that she is making it clear that she intends to reclaim her independence. Do hope you still need it because it will definitely help you.