Sometimes hamsters will jump to see something higher up, just like us trying to see over a wall that’s taller than us. It may also be her way of jumping from things. One of my hamsters, a Russian dwarf, launches himself from things and lands on all fours.
All hamsters are different and have slightly different ways of doing things and it looks like this is just one of her quirks. Like you said, sometimes they jump to get your attention. And because she is small, she may feel the need to do this by jumping from things, and they learn quickly to do things that may have caught your attention before. But this is nothing to worry about
Hope this helped x