Can they do this? She is 78 and lives alone. The Rehab facility she is in, wants to release her 2 days before my husband can get down to AZ to take care of her. Can they legally do this. She will be 2 weeks post surgery when they release her, but she will not be able to drive yet.
Talk to the social worker at the facility.
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My mom at 84 had a broken shoulder, a broken back, renal failure from dehydration and an UTI requiring IV antibiotics and was released from rehab
Do what you can to bridge the time to your arrival but please don't assume your mom can live independently - knee replacement can be painful and infection can occur - you need a plan in place - if you are not her POA both financially and for health decisions then get this paperwork handled as well or could have a real crisis in an emergency situation
Also how kind of your husband going to help your mom
The point is that there is not some magic number of in-facility rehab days that everyone who has knee replacement should have. Some might need none, others a couple of weeks, others longer. The determining factors concern meeting rehab goals.