Is it normal my sister wants to f up my life?

My sister and i are like oil and water, though she used to be my best friend. I have always been the "good one" while she has always got into trouble. I stayed in school and went to college while she dropped out in middle school. I admit, her life must have been tougher than mine, but she is 6 years older than me so i don't know or completely understand all the details of this. Anyhow, this is why i have always stuck by her and have her the benefit of a doubt and a thousand second chances when no one else would. She is bipolar and has anger issues.

We were tight until i got pregnant. Our relationship has gone downhill since then. Before i knew i was pregnant, we got in a fight and she moved in with one of my best friends and eventually screwed up my relationship with that friend. Then when i had my daughter she convinced me my daughter was mixed (obviously certain circumstances made this a possibility) and even brought the alternate father to the hospital when i told her not to. I ended up not even talking to my baby's actual father until she was three months old because i feared that one day she would...not look like him. she then proceeded to talk smack to the other guy until he and his gf and 2 others jumped us both at a store with my daughter in the car. A month later i move in with the father. He knows everything and we are happy. I kept me and my daughter on my sister's food stamps.i know my sister sells some and me and my daughter should get more than $70 but i let her get by with this because she needed it more than me. However, she took advantage of this and has not even given me my share some months. Even when i gave her money so i could get more than 70 dollars of food.she tells my parents i do drugs when she's mad at me, but all i do is smokea little weed before bed.but she says i do oc because i tried it one time, around the time of our last fight.when i down and out she doesn't help me even though i have helped her in many ways.i don't want anything to do with her anymore although i love her and wish the best for her.i also found out she's writing to the other guy in jail.she isa messed up person. Does anyone else have to go through Shit like this? IIN?