Ahahaha I used to use baby ball pythons at the petstore i worked at to make betta males trip out. I thinks its a preditorial response, they might think its a water snake n trying to show its got spines. But nice pics i hope she gets the hint n you find more then one under there.
(PS there is alot of betta "moprhs" n pattern n styles out in the world seen ones for $55)