Something wrong with my hamster?

This morning my hamster was slowly moving. She has been alive for about half a year. I am thinking she is a bit stressed because I keep switching cages.I just yesterday got her a new critter trail cage. I got her in June when that's when I got my first critter trail cage. Then in august, I got her a aquarium tank cage. I switched back to critter trail. Because she absolutely hated the tank cage. I'm wondering if she is just stressed because when I held her after school today she was super stiff. Thanks for your answers