I learned with my dad that if you say, at any point, that you want the person to come home, they will mark the chart "discharge to home according to family's wishes". This is because there is a huge shortage of nursing care, and if they are transferring the patient to rehab, they may have to wait up to 3 days. Days during which they can't use that bed for someone who is actually sick. The key phrase you need is "unable to safely care for". That means they MUST send her to rehab. And just keep insisting, no matter how many times someone suggests that she will get better faster and feel more comfortable in familiar surroundings.