Hello dear, thanks for your question on HCM.
I can understand your situation and problem.
In my opinion she is having
CO2 narcosis (excess carbon dioxide in the body).
It is common in smoker. Due to severe damage in lungs (because of
smoking), carbon dioxide can not be completely expored from the body.
So this will slowly rise in the body.
Excess of CO2 supress the
Central nervous system (CNS) and makes person unconscious.
So she might be collapsed mostly due to CO2 narcosis.
The treatment of this is
hyperventilation.
So patient is put on mechanical ventilator and hyperventilated to remove excess CO2.
Viral infection is associated can even worse the condition.
So she is also undersedation to achieve good ventilation.
Ask her to quit smoking as soon as possible once she is stable.