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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
Can you share video of what you're seeing?
I am very sorry to hear of Marshmallow's passing. The symptoms you mentioned suggest this may have been an upper respiratory tract infection. Was she in with any other hamsters?
Hopefully this did not transfer to the robo hamster since they are in different cages. Unfortunately, URI can onset very quickly and debilitate an animal within hours, in some cases. Since she was so young, I imagine this is why she went downhill so quickly.