Why is it that only those employed by companies, full time and the wealthy can have health insurance.?

A friend of mine works six hours a day, five days a week and of course this company does not provide health insurance for 'part time' workers. She has spent innumerable hours trying to find health insurance she can afford but her income is so limited she's been unable to secure this. She is 52 years old and does her very best to provide for herself. Are there any answers to this dilema. It seems so unfair that some can get care when they have money but the others lives seem to be rated less valuable.
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Employer sponsored health care started out as a small perk about the time of WWII, and morphed into this highly inconsistent & unbelievable complex system we have. It seems profoundly illogical for our country (the US of A) to give lip service to promoting business & especially small business, then saddle the poor entrepreneur with health care expenses for the employees And if some employee is chronically ill the small business is punished de facto for carrying that person. And if a person has a chronic illness, they can't change jobs or will loose their insurance. Then if they loose their insurance, they can't get reinsured as now have a prior condition. A Pro-Business stance would be universal health care! All the other civilized countries of the world have it.
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