I thought insurance companies couldn't discriminate because of preexisting conditions according to ACA. Not trying to get political, I'm honestly not sure how it works. If so, why not just sign her up for a high deductible plan?
She's in Arkansas which doesn't subsidize so while they do have exchanges and that is an option it will probably be fiscally impossible. They can't deny you coverage, but they can sure charge through the nose for it and in states that are trying to kill the ACA like Arkansas they have done everything they can to reduce the effectiveness.
However, it is actually the first thing on my list to go through with her when I get there, so that may work.