Help for paying health care insurance. Does anyone have any suggestions?

Yes, she should already be getting Medicare. I say that, because you said that she couldn't get coverage through the Healthare Marketplace. That is one of the primary reasons that people can't get it there. If they are are getting Medicare. In fact, I might consult with a disability/Social Security attorney to figure out what's going on. But, I agree, I'd also explore Medicaid. That would cover all meds over what Medicare doesn't. There are some supplemental medication polices that you may check out, too. They can be helpful. AND if the income is low enough, she may qualify for what is called EXTRA HELP. That pays the monthly premium for the Supplemental, so, for a disabled person with limited income and assets, there may not be any out of pocket for medical costs, at all. I'd explore what she is already getting and what she may be entitled to. I can't wrap my brain around a disabled person paying such a high monthly premium. I have no clue what that is about. That's why I'd get a professional opinion.

Right, go for Medicare and Medicaid. They could have gotten Medicare (at about $105 per month, deducted from SS checks) when they were 65.

Check your local county and state's elder care programs to see what else they can get ... food, utility support (we have lower electric bills b/c we're seniors, and are also on a non-shutoff program). Contact senior centers social workers and ask about other programs. Some senior centers have more extensive outreach programs, so you may have to call a few (try the more upscale areas) before finding one that have a broader program of assistance. (Some in my area primarily plan bingo games and casino trips.)

Check out food pantries such as Forgotten Harvest. Check out the community in which they live to see if it gets HUD grants for emergency home repairs. Habitat for Humanity also helps in this area, as do some Methodist churches in some areas.

They can also get clothes and other household items from Salvation Army. I was a bit shocked when I learned that some relatives had been shopping there for years, but when I checked I out, I found a LOT of name brand, high end clothes, some of which would have originally been sold at places like Macy's. And they were a fraction of what the original cost might have been, and in good condition as well.

Thank you. Another friend is going to help her apply for medicare. We think she should qualify.

I"m no expert, but, when my LO, who was on disability before age 65 she got Medicare medical coverage. When she turned age 65, she kept Medicare medical. Her disability checked stayed about the same, but, came from Social Security. I'd likely check with an attorney to find out the status. Maybe, someone here could offer some suggestions.
You can also apply for Medicaid. That pays the medical bills that Medicare doesn't pay.