Is it normal for controllers to tell a plane with an engine down to contact approach without saying anything else？
Well, it at least shows she understood the emergency and offered an immediate return. She gave the frequency - all other information can wait and be exchanged later on. Swapping frequencies is quick, but saves the extra delay for tower/departure from coordinating and relaying - so speeds up communication for all involved. Also, a single engine failure usually isn't such a big deal, which would prevent a crew from changing frequencies - unlike Sully's double engine failure, where changing frequencies rightfully wasn't even suggested. And when a pilot prefers to stay on the frequency anyway, or delay the approach, he'll surely just say so (no need to ask).
So, yes, that was an extremely brief no-nonsense reply, but not really bad.