I was obssessed with this movie when it first came out. Watched it over 200 times, and the theory's wrong.
So when Beatrix enter the hacienda and sees her daughter and Bill play fighting, it was all a figment of her imaginiation.
When she was up in the mountain with Pai Me, she did learn the 5 point heart beat exploding technique. Of course Tarrantino wasn't just going to spoon feed us that. It was quite evident when she was buried alive and reminiscing about Pai Me's training, that she acquired all his skills. Don't you remember when she was feeling for pressure points inside the coffin. When she found it, she was able to punch her way out of the grave.