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This is simply a horse that has no ground manners. Horses are big enough animals that to be tolerable, they need to have good ground manners. This horse has no manners at all.
You need to teach her to respect you, to stay out of your personal space and to respect you at all times. Right now she is just a wreck looking for a place to happen. If she paws you, knocks you out of her way or knocks you down, she WILL hurt you. She can easily break your bones.
Get someone to teach you some ground exercises and get them to teach you how to teach her to respect your space. She needs to move back and over each direction when you ask.
You can do a search here on the Forum for respect and ground exercises. There have been hundreds of threads written that detail dozens of exercises you can teach her that will make her show you the respect you deserve.
There are Clinicians that have DVDs out there that show people how to get respect. Clinton Anderson is probably the best at making it understandable. His groundwork is very effective at making a respectful horse.