Do you think I was wrong?

Okay so I told my bf's sister to not call me anymore.
Don't judge too harshly...I have my reasons.
1. She over exaggerates when she calls. Like saying it's an emergency when it's not.
2. She always takes her brother's side when we fight.
3. She accuses me of not seeing the things she goes through because she recently lost another brother(that never liked me to begin with).