please answer this hamster question?

[frank]

I just bought a hamster shes kinda big and the wheel that came with the cage is to small for her so we went out and got her another which turned out to small too lol... well my question is.... what would happen to a hamster if they dont get enough exercise... shes a ball that she goes in all the time... but she cant just be in her ball all the time.. were gonna get her a new one in a couple days but she seems bored... so if anyone knows let me know please
thanks

 

[MariaB]

She'll be fine as long as she has a good sized cage that she has room to run around in.