dear,
yes, life support is indicated whenever a body's critical system is compromised or not adequately functioning.
Brain, heart, lungs, kidneys, these are prime organs who's proper functioning is required to maintain life. Any sort of grave injury to these organs may potentially warrant the use of life supports like ventilator or
dialysis, etc.
As
stroke insults brain, which is the principal organ controlling all other systems, any
brain injury warrants life support use.
therefore, If your treating doctor has advised you to put her on life supports, it must a critical desicion, and withdrawal of any of supports may pose a direct threat to her life.
Hope my ans satisfied query. welcome for further details and queries.
wish you her a good health.
thank you