I don't know about the first movie, but I don't think she did the stunts because they were very dangerous (although I read that she did bungee jump).
But on the second movie, she had training and was able to pull of some, but perhaps not the entire scene of every stunt.
I watched COL making of and it was amazing she did the upside down rope slide from the high mountain cave in china
The jet ski, I don't know if she did it or not, it seems hard for her to do it knowing that it took her some time to be able to ride it
Watching the making of the movie will give you better answers