Why are my parents lying to me?

My little sister has avoided me for months. She’s deciding to let some people go in her life, one of them being me, and I’m not sure why… My mom says she’s going through things, but I knew that wasn’t true because she had purposely been avoiding me… She won’t speak to me and when I ask my mom why, she said she doesn’t know… I don’t believe that. What could I have possibly done that my sister has decided to no longer speak to me?
Why are my parents lying to me?
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