Yes, believe it or not, the way your little one is acting is perfectly normal! LOL When they're very small like that, they don't have much sense about jumping off of things.
It's doubtful if your little one will hurt herself while she's in her tank, but, if you take her out and carry her around on your shoulder at all, keep the palm of your hand over her back to keep her under control. Some of them, at that age, think that they can fly,and think nothing of jumping off your shoulder, or off of any high places that you might put them, if they see something that interests them and they want to investigate it!
As she gets older and larger, she will eventually develop some sense about what is realistic and what isn't, as far as the distance that she can jump from, if you can keep her from giving you a nervous breakdown, or killing herself, in the meantime! LOL GOOD LUCK! :lol:
On a brighter note, you obviously have a healthy, nosy, active baby.....
enjoy her while she's small, because they don't stay little for very long!