Homan and Trump will not let this happen. My guess is she is not really illegal right now, maybe some sort of temp status and Murphy is grandstanding. If illegal, Homan will arrest her and then refer he and his wife for prosecution for harboring.
This is one thing the Trump team has to keep in mind: liberals may dangle some tainted bait in hopes ICE will over-react and arrest an American citizen or someone in the country legally.
Liberals are dying for the chance to scream bloody murder.