[LunaTheHamster1]

Hi and welcome, I am guessing by your name your hamster is a syrian? I'm also guessing as the cage was from a pet shop that those measurements are in cm's and not inches?. If so, the cage is probably not big enough for a syrian, especially a girl syrian. The height worries me, because if it is 25cm, you might not have a correct sized wheel for a syrian.

Are you able to post a pic of the cage and her set up and maybe we can help with some ideas to help., but you may need to get a bigger cage, but if that is not an option at the moment I am sure we can suggest other things that may help.