Here’s a possibility:
Seizures happen in 1 of every 10 people who have a traumatic brain injury, TBI, that required hospitalization. The seizure usually happens where there is a scar in the brain as a consequence of the injury.
During a seizure there is a sudden abnormal electrical disturbance in the brain that results in one or more of the following symptoms:
Strange movement of your head, body, arms, legs, or eyes, such as stiffening or shaking.
Unresponsiveness and staring.
Chewing, lip smacking, or fumbling movements.
Strange smell, sound, feeling, taste, or visual images.
Sudden tiredness or dizziness.
Not being able to speak or understand others.
Symptoms of a seizure happen suddenly, and you are unable to control them. Seizures usually last only a few seconds or minutes, but sometimes continue for 5 to 10 minutes. You may have a bladder or bowel accident or bite your tongue or the inside of your mouth during a seizure. After the seizure, you may be drowsy, weak, confused or have a hard time talking to or understanding others. After a severe seizure, one that lasts longer than 2 minutes, it may be harder for you to stand, walk or take care of yourself for a few days or even longer.
Conditions that could increase the risk of having a seizure include:
High fever.
Loss of sleep and extreme fatigue.
Drug and alcohol use.
Chemical changes in the body such as low sodium or magnesium, or high calcium.
It is possible she is getting these symptoms.
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Strange movement of your head, body, arms, legs, or eyes, such as stiffening or shaking.
Unresponsiveness and staring.
Chewing, lip smacking, or fumbling movements.
Look at the beginning of this video:
https://www.youtube.com/watch?v=azUpfzDNxpw