Hammy advice

So I have a 4 month old hammy called Rosie May. She´s fabulous, although I just can´t seem to keep her entertained. She lives in a 3 tier cage, which is longer than it is taller, and has a tunnel that comes out the cage, which she loves. She also comes out of her cage regularly for time in her excerise ball, her playpen AND her ´playbox´ which is full of various toys and things to explore.

It just seems that whatever I give her, and no matter how long I let her out, she´s chewing on the bars of her cage. I know it´s some hammys dream to escape, I just want to make her happy! My other hammy Sooty, who passed away a few weeks ago, lived in the same style cage and never chewed the cage his whole life! I know that every hammy is different though, I just don´t want Rose to hurt herself. She often goes to chew her water bottle too, so she gets covered in water and I´m worried she´ll catch a chill! It´s not like I can take her water bottle off her!

I was just wondering if anyone had any advice on how to keep hammy´s from getting bored? Those treats you can get that are like a bar of seeds stuck together keep her busy but I don´t want to give her those every night! Any advice anyone could give me would be greatly appreciated!