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First her pulse rate is not high. It is under within normal limit. Her BP may be problematic, so monitor her BP. Some time person had postural hypo-tension specially on standing from sitting position, so get it tested.
Apart from that she should get her hemoglobin
testing done. As low Hb can lead to weakness and dizziness
. If above causes rule out then she should be evaluated for Depression
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal