She can go to rehab, but I *think* in order to get home PT she needs a PCP licensed in the state where she’s receiving services, to write orders and follow her in the community. So she might not be able to get home PT at a relative’s home, in a different state than she resides. Check with the discharge planner, though (usually a social worker or nurse case manager).
But rehab benefits are the same across every state (unless has Medicare advantage, as PP said - if that’s the case, her rehab stay will need to be approved and authorized by the insurance company and she would have to go to a rehab that participated with her insurance).