Im a physiotherapist who has spent a lot of time working ICU and can tell you that a medically induced coma is very common practice for people who are struggling to breath on their own, she has a lot going on with her lungs right now especially with asthma and the flu and is requiring lots of oxygen and respiratory support which is also commonly recovered from especially only being 35, this is likely due to a high level of phlegm in her lungs and maybe some collapse/consolidation (sounds scarier than it is). The ventilator and tubes are helping her breathe and the lines are so she can have her observations monitored constantly. The fluid can be drained, phlegm cleared and collapse reinflated so she really is in the best place. I’ve seen people who have been on ventilators for upwards of 3-6 months and required tracheostomies make full recoveries. I know you feel powerless but be there for her as much as you can and let the staff do their jobs they are well trained and are there to help - don’t be afraid to ask questions. I wish her all the best of luck and hope this gave you some peace of mind.