I Want To Put An End To Bullying

OK my sis for whatever reason don't like me. After years of she leaving me out of things eg her wedding planning, her children's bday...although she invited my other siblings.. I have decided it has it stop. She told my aunt some shit abt me... And I doh want her to continue.... I once asked her if everythings ok and she was liked what u talking abt. No doubt I'm an easy person to bully...but I want it to stop in 2018.☺
How to politely ask her to stop wo looking like I'm controversial.