Wow, she is quite the little Einstein!
I hear of alot of birds learning how to open that kind of cage. Norri's old cage had the same kind of doors, and since I knew Norri wouldn't chew on it, I used a bent paper clip (with the extra/point parts outside of the cage), and it kept it good and secure.
Now his cage has latches on it, so I don't have to worry.
I admit that I'm unsure if that is safe, and now that I think back, I don't think it was very wise of me. Though I do know Norri's personality, and he's not one to chew on things and such.
If I was you, I'd wait for someone else's reply, they're more reliable than I am!
Good luck.