I'm not sure if this is the way you want it to read, but...'She is now 97, has just had a hip replacement and will need to go into a care home of some sort....'
Why?
A hip replacement is meant to give you back your mobility, not take it away from you and make you completely dependent. True, she will need physio etc and may need it for longer than a younger person would, but unless I have read it wrongly I cannot see why having a hip replacement at 97 necessarily means that she'll never be able to live at home again. Her orthopaedic surgeon must have thought it was worth doing!
PS: I've had both hips replaced and one of them has been revised twice.