OK, but use she's for register.
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alc24What is it to you...?This phrase is not one that you should say to someone you plan to see again. The tone is quite rude in my opinion. You wanted to know if your sentences are natural. But in fact, majority of them are very unnatural and awkward. Why are you not using the advice the forum has given you?
alc24What is it to you if
alc24What is it to you that she comes? What is it to you if she comes or not?Both are common.