Mom is angry I want nothing to do with niece?

My niece behavior has been nasty and we don't get along. She's 15 and I have tried ti push her in the right direction and nothing has worked. I'm living in a new city with my fiance now and I don't care for this family drama. My older sister is the mother if this niece and they both don't like me. Why does my mom think I owe my niece gifts or money?

Mom is angry I want nothing to do with niece?
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