My sister always mad at me for no reason?

Hello There,

I am Twenty three and she is two years younger than me. The things is she is always kind of in angry mood, there is no doubt that is her nature, but sometimes I feel it unnecessary.

It not like she always like that she do ask for help when It requested. but most of time she is kind of unfriendly to me.

My sister always mad at me for no reason?
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