There was a lot of press coverage about this type of thing, but it was years ago when ACA first came out. You just don't remember it. I do, vaguely, because I was working in the health insurance industry so I followed it more.
The ACA, while it did a lot of good, is also deeply flawed. This is one of those flaws. I'm sorry that you got caught in it. Ironically, she might be better off with a part time job that doesn't have benefits. Good luck figuring things out. You might have some success in internet searches to see if there are creative workarounds (just stay on the side of legal!).