Why is she angry ????

[pariahdog]

i thought feeding her in her tank isn't good because then she remembers the opening of the cage as "feeding" time and it will be more aggressive.?

I think most people here would agree that's a myth, or at least not relevant to ball pythons. As dumb as bps are (I love em to death but they're not that smart lol), I think they can tell the difference between a human, and a human with a rat dangling in tongs.