What exactly did congress do? Give her access to the courts? That is not infringing on another branch of government. They(congress) can do whatever they damn well please as long as it doesn't interfere with another branch of government. They are supposed to pass whatever laws they want.
They interfered with states rights. And yes congress can pass any law that want to. If they pass a lwa that says everyone must wear their underwear on their head every second Tuesday of the month, and the president signs it, they can do it. But that does not maker it RIGHT or SMART!
Cause they where interfering in state matter...