Thank you for posting your question here, I will try to answer it to the best of my abilities.
The body maintains its balance through a series of canals present in the ears, so if your friend is having trouble maintaining her balance, her ears are the first thing I would have checked. As such take her to an ENT specialist
My next suspicion would be that the problem is neurological and there is a problem in her nerves. To confirm that she would need to see a neurologist
But get her to an ENT specialist first, since it is most likely caused by a problem in her ears.
I hope this helped.