They'll probably want to get her into a pre-admission clinic beforehand, and they'll be able to answer all her questions then. They might ask you to take in the heights of all relevant surfaces - sofa/chair, bed, toilet, and measure the width of the bath from outside edge to outside edge, so that they can arrange any equipment she'll need so it's there before she comes home. If she's otherwise fit and well and they operate a hip pathway, she'll almost certainly be out in less than a week and should be absolutely fine within 6-12 weeks. Post-op limitations depend on what sort of new joint they give her and the angle the surgeon goes in at.