Let's look at the context.
Would you go if she called you?
Yeah. I might go.
Is it correct to use 'might' here rather than 'might have'? I think here 'might' is used as the past form of 'may'. Right?
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Yes, it's correct to use might.
It's a way of saying: **Yes I might go if she called me.
Might have is a short form of might have gone.
This answer would be correct if the question had been:
Would you have gone if she had called you?
Yes, I might have (gone).
This is a question in the hypothetical past - what might have happened if a situation had arisen. You will find lots of examples if you google it.