Is my roborovski hamster gonna die?

Bought 3 days ago a pair. This morning when touched Pinky, no movement.Normally she would jump or startled. Only the whiskers showed some movement. After 1/2 an hour later,just about when leaving for office, i saw her running all over the place again. Waited to see her. She played around shortwhile and then sat quietly back in the nest. Is this robo sick or going to die or just fooling around?