I got 2 dwarf hamsters 4 days ago. They have a nice home and are happy for me to pick them up. However, the much smaller of the two has now moved from the bed they shared and sleeps curled up in the corner of the cage. She is very still and docile all the time. When I handle her she is active, I have also put her into a little maze which she enjoys for a short time before sitting very still again. She has been to the toilet, but she is not interested I'm any food.
The other hamster is very active but they seem to get along okay although the small one shows no interest.
Does anyone have any idea what might be wrong? I am so so worried
They are about 9weeks old.