my horse has good ground manners bad riding

I recently bought a 12 year old arabian named bella and she respects me on the ground. She respects my space, follows me around without a lead rope, I can say stay and she will, I can say walk and she will, I can say whoh and she will, if I get near her an give her a apple and walk away she will follow me untill I leave the pasture, if I run she will run behind me in a happy manner. But when I try to ride her she is hesatant for me to mount an when I do she bucks and throws me off. When I got her the first3-4 weeks she was perfect for everything, now she only respects me on the ground. But when I have my dad around she calms down and respects me and does anything. And how can I get her to stay put when I mount off a mounting block without my dad holding her?? And she's good on the ground but hates being tied up, and lunging. She keeps pivoting when I try to mount

Go and read the responses in the other thread. Your horse doesn't have good ground manners. All this boils down to her not respecting you so stop making new threads, we won't give you a different answer.
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Read your other thread until it sinks in...

Super Bad and Dangerous Horse

I don't think you can have a horse that has "good" ground manners and be horrible when you get on her . You are really putting yourself in some serious danger here. I just hope your parents open their eyes and realize they got you a horse that is to advanced for you before something horrible happens , either to you or the horse.

I have been taught how habit can influence any horse. My horse also loves my dad, and recently I have been taking more note of this by asking my dad to leave the area to a place where he can still watch me ride but where I am more focused on just my horse's training for that time. My horse doesn't do anything terribly wrong, she just often times enjoys walking over to my dad or turning her head. Lately, since I have changed my training up in several ways, I have noticed even more effective results from each ride. Basically, I strongly suggest to you what other people are probabbly suggesting (I didn't read the responses though)... professional training. A trainer that can help you ride your horse, a trainer that can hop on your horse for you, ride your horse for you to solve your problems, and help your horse reach the level of discipline that is both safe and necessary. Please keep in mind that if you are in danger and if your horse is a threat to you, do not do anything until you are in safe grounds and with someone that can help you through this issue. Of course horseback riding isn't a 100% super safe sport -- everything has its risks. But just keep in mind, which you may be already, that if you anticipate your horse will start bucking and you understand the risk, wait for someone more experienced to assist you for your own safety and the safety of your horse. I hope this works out for you, and don't be discouraged. We all have minor setbacks and I hope that this will work out well and that your horse will understand how much fun riding is. (: