Responses
It depends on how severe the asthma is. They could have been in and out so often they might even have a regular rooms.
Your second point is a valid concern. Hopefully this will be explained in future chapters.
I don't think the older sister is in the ICU. The doctor was just being called to the ICU from a normal wing of the hospital. Alternatively, it is not unusual for patients who have been hurt in auto accidents to be put in ICU until their condition stabilizes, then they're moved to a normal wing of the hospital once it has.
Erm, way too many plot holes here. Not to my taste - too unrealistic.
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Spoiler Alert
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Why they would spend their lives in a hospital just to treat asthma
How she could have a hidden baby while spending her life in a hospital
Why she would be in ICU with the, essentially minor (according to the doctor report) injuries she had?