Civil rights are being violated. She is a disabled women. Her husband is conspiring to have her starved to death. That IS a violation of her rights and of the law. Both Bush boys have a legal cause to intervene.
By that logic if I pushed someone down the stairs who happened to be in a wheelchair, I could be charged with a federal violation of civil rights of the individual as well as attempted murder? Do you really want to go down that path? Can you even imagine how liberals would use that? Heck, it'd be hate crimes trials all around!!
If you do that, you've completely accepted supremacy of the national government over the states, in effect destroying the federalist system established by the Founders. Of course OTOH, it's not as if it wasn't destroyed long ago, so what's it really matter eh?