nicky has lots of scratchs on his belly from climbing...

[Nicky]

Nicky my cornsnke has lots of scratchs on her belly , i think its because she likes to climb and she goes up on this really thin ledge dats only like 1cm thick which is attached to the cage and trys to sit on it and then falls and gets cuts on her belly and starts all over again. i gave her branches and stuff to climb but she ignores it all and goes for the ledge shes about -5 sm thick and the ledge is to thin i don;t know what to do why would she keep doing it if its hurting her? theres been no blood or anything but she keep scratching off bits of her scales i don;t know what to do??