She may still be in shock from the fall, these things to happen though...as everyone here knows, hamsters can be little mischief makers!
Definitely keep an eye on her and see how she is after a rest - make sure she does have access to water/food and if she has a wheel, maybe take it out so if she does have any damage, it won't be worsened. If she doesn't show signs of improvement then the vets may be your best option to check over if she has anything broken but in all honesty, you are her best bet as you know her behaviour.
Don't worry too much, keep her in a calm place too so she gets rest, good luck!