It may be she strained the tendon or pulled the muscle that runs from her elbow to her carpus or 'wrist'. This may have happened when she jumped off the bed and hyperextended that joint. If there is no swelling or heat back there it shouldn't take long to feel better. If it doesn't improve over the next week or gets worse, you might take her in to get it checked for any joint or bone involvement.
__________________
Holistic Wellness Care