My mother felt dizzy and dissociated; what technique is safer for her anxiety?

During the first silent meditation, my mom had become so dizzy and dissociated that she is now frightened to repeat the experience. This sensation was too dreadful to her, and it continued hours after. Her daughter is concerned about her mental health. Her name is Avani, DOB is 17th February 1965. Will external, such as sound, focus be a safer form of focus than internal focus to her anxiety? She must have a grounding method.