None of my hamster wheels fit in my cage what can i do?

She has a ladder, a wooden alligator chew toy, a wooden hanging chew toy with a bell, but i can't fit in a wheel. she's getting really big and sleeps alot. she's still very playful and will be a year old soon, but i can't find a wheel to fit in the cage she has. is this a problem? what can i do?