I think she is just sniffing and whisker twitching quite intensely and it makes her look like she is shaking. That would be normal as she settles and and assesses her surroundings.
Obviously if it seems uncontrollable or she fits or anything she would need a vet check.
The cage has a very high shelf there and that could be dangerous if she fell off. Tall cages are not ideal for dwarf hamsters in case they fall and damage themselves. I'd try and install overlapping shelves so that any jumps or falls would only be a short way on to the next level. She's a cutie
