My mare almost killed me today, do you have any behavioral tips for me?

Watch some videos about how to gain a bond. Don’t feel nervous when your around her or she will be more nervous. Be confident!
So this is just when ridden? It's a bit difficult to know how to advise if we don't know what's actually happening, so sorry for all the questions!
she was fine when I got on, and did my basic warm ups. She stopped recently, and no.
What did she do, and what did you do before and after? How often is she dangerous? Is it the same every time?
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