Sister blow up

Ok, so here is the thing, you'll need a lot of info and I'll add more if you ask. my sister is 28 and her oldest daughter, brooke, is 12. brooke goes to the horse shows with us on the weekends. she rides on saturday nights but she usually rides my...

barrell mare and I train my palomino. well, my barrel mare is hurt so brooke asked her daddy to bring her horse there so she can ride. my sister, bridget, and brooke's dad, fudd, got a divorce about 5 or 6 years ago. brooke never goes to her dads' anymore but she has been talking to him more since going to the horse shows. And bridget never goes to the shows anymore because she has gained a lot of weight and can't ride like she used to. I will get more on this in a second.
Ok, so fudd brings brooke's horse to the show and we all sit around and talk and are having a good time. brooke rides the horse and she does pretty good. fudd brags on her and acts like the ultimate dad. so brooke is supposed to spend a week with her grandparents, not my mom and dad. Well, her grandmother comes down to say it's time to go but brooke has one more event to do and asks if she can stay with her dad tonight. we all talk and come to the conclusion that it's ok. so brooke rides and then goes home with fudd. And the grandmother calls my sister to say that brooke is with fudd, just to let her know.
So bridget texts me and my mom and here is the whole enchalada for ya. I'm warning you now, it's more of a volcano taco. bridget has gained a lot of wait and hasn't rode a horse in years and since she won't ride she doesn't come and watch her oldest daughter ride and do really good since brooke riding doesn't have anything to do with bridget having her fun. so bridget sends brooke with us and I am personally all for brooke and fudd getting closer because they can only spend her childhood together once, you don't get second chances. I consider me and bridget close but I can't understand her at times. she gives tells her 12 year old daughter not to go home with fudd but she doesn't let us know. brooke is only 12 but she is as tall as me so I can reason that bridget will think her as mature as me but I can honestly say, with no teenage animosity, that I am more mature at 16 than my sister has ever been in her 28 years. ok, that out there for my ego's sake, I love my sister but I can't forgive her for this. my mom hasn't rode a horse in years but she got back in the shows and everything because I love horses and because I wanted to ride but have no other way there. my mom became secretary at a show to keep her occupied while I'm riding my horse. my mom is there for me just as she was for bridget. but bridget cannot come to watch her oldest child ride a 2000 pound animal and ask it to do what she wants and place among other more experienced riders because she can't ride and therefore thinks it won't be fun.me and bridget got into a huge argument and she has tried to make up but everytime I think about her I think of how brooke felt bad and tries to ride perfect so her mom might come watch her. she has cried to me wanting to know why her mama don't want to watch her. but being the oldest her mom never has time for her other than when she tells her to watch her siblings then it's back to making a 12 year old into the perfect mom. what about letting her be the perfect her that I see smiling when the horse kicks out while running, or yelling to her dad as he watches her push a horse faster, or even laugh and play around when she is used to being the mama. I watch my niece have fun and be a kid every weekend that she's with me.

o m g, could you make it a little more to the point next time, sorry but WWaaay to much 4 me.

so, what's exactly the problem?? where is the Q???

Ok, sorry. I just noticed I didn't say what I needed. I need help on how to talk to her about this because I get mad everytime I think about it and she doens't listen. She is forever stuck in that she knows best stage.