Is she 39?
Is this happning on a regular basis?
Was she distressed by it?
Is she on any medication at present?
To be honest I do not think there is anything to be concerned about here.
The symptoms are NOT consistent with any serious brain pathology or disease.
Most likley she has had a vivid dreams - partly due to the meds she is on.
If the problem persists it would be worth reviewing her meds with her own Dr.