Hi Oatmeal_Cupcake. The first thing that comes to mind is...maybe her water bottle isn't working right? If the bottle is okay, do a check over of her whole body looking to see if there is anything that doesn't seem right. If everything looks okay, I'd just watch her for a day or so. Hamsters can sometimes have these outbursts with nothing we can see that can tell us what's going on. I hope she's okay and just in a mood.
