I don't know if the question below is prone to split hairs or something like that
though I did come across it while partaking in the qualification exam in one of
Taiwan universities.

It might be easy for a native speaker. But for us (at least, for me), it appears to
be a hard one. Can anyone properly tell of the difference?
Which of the following three(3) sentences is the most acceptable one in oral
English and why?

Thank you soooo much.

1 She is easy to get mad with others.
2 It is easy for her to get mad with others.
3 She easily gets mad with others.

I agree with your assessment. I would add to your explanation that (2) is wordy and it is a passive sentence. The third sentence is efficient and direct.
Hi runner,
I think the most acceptable sentence is (3) because number (2) seems to be too formal for oral English. I'm not sure about (1) but I think it's not a proper construction in English.
 MountainHiker's reply was promoted to an answer.