It's a comic book movie, based off the comic books, so...
*SPOILER*
She said that she trained with a different sensai every year. Through her training she learned many different techniques. She used her ninja training to slow down her heart rate so that she wouldn't lose as much blood from the wound.
*/SPOILER*
Like I said, it's a comic book movie, don't try and look at everything from a scientific / realistic point of view and just take it for what it is.
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