If she currently has insurance under obamacare, she should be ok. SHOULD, since we don't really know exactly what the deal will be.
But, with someone like Paul Ryan's plan, even if she has some kind of pre-existing condition, in theory she should be able to keep her current plan going without sudden and crazy jacks in prices.
The people who are really screwed, are folks who let their coverage lapse, and have pre-existing conditions. They will perhaps be LESS screwed than they were prior to the ACA, but they'll still be screwed pretty hard, as they'll get put into high risk pools at best, and then end up paying twice normal for health insurance, forever.
My sister is in this boat, recently left her job and became freelance, and hasn't gotten insurance yet. She let her Cobra lapse, and I've been yelling at her that she needs to get a plan in place NOW before next year, because who knows what's coming down the pike.. but she'll have a better chance if she has a current plan going.