You do not say if anyone has tried to find out why your mother-in-law has vertigo. If the cause has not been established, that would be the place to start.
Vertigo can be caused by something as simple as the wrong precription for her glasses. It could also be due to a number of physical ills from dehydration to wrong blood pressure, thyroid trouble etc. etc.
So, by all means get back to her physiotherapist and tell him or her that there is no way the poor lady can do these exercises, but get hold of her GP too and ask why he or she has actually diagnosed.
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