Having a servant who is paid but is well-cared-for is problematic, but not necessarily wrong. Having a servant who is abused daily, made to sleep on the floor, kept away from her family, forced to work when sick, denied medical care for no good reason, and not allowed to leave is blatantly obviously wrong. There's nothing but physical/sexual violence distinguishing this from the horror stories of the pre-Civil War American South.

That much at least is pretty black and white, and even 100 years ago that was not the default state of most wives, so I'm not sure what point you're trying to make, and I'm certainly not sure what you think is "lite" here.