Is there someone who can take her morning blood pressure? Also throughout the day when she is, and is not dizzy. I agree she needs to have meds checked as well. Is she on blood pressure medication? That is a common cause of dizziness in the elderly and it is frequently ignored as a benign side effect, sometimes people need less as they age.

How is her heart? I don't know much about it and don't want to scare anyone but dizziness can be a symptom of cardiac insufficiency too.

I've had morning dizziness called benign orthostatic postural hypotension all my life, it may be that she is experiencing that due to her age with no cause other than her bp just doesn't rise as fast as it used to. If she drinks coffee ask her if she feels better afterward, it raises bp a bit.

I'm not too elderly but recently had problems falling over as well. Dr wanted to treat me for Menieres Disease , but I discovered my bp was way too low for me and stopped my low dose bp med and I'm better.

I hope you can find something that simple for your friend.
Judi