Hello! Thank you for asking on HCM! Regarding your concern, her symptoms may be related to a cervical disk problem causing a radicular pain irradiating in her right arm. Has she complained about neck pain or arm pain before? A wrong position during sleep, can also mimic this clinical scenario. The fact that she is walking around is an indicator that nothing serious has happened (we can exclude a possible stroke, which would have other symptoms too). I would recommend consulting with a neurologist for a careful examination for neurological signs. A cervical x ray and a nerve conduction study may be necessary to establish the cause. Hope to have been of help! Greetings! Dr. Iliri