I'm sure its hard for her to retire because as you stated nursing the pts, and her fellow employees is all she has. she has no kids, husband has died, and maybe she understands that once she retires she will be alone which is scary. Maybe someone can talk to her about what her plans are for her after retirement. Give her the option to always volunteer or even educate future nurses. Yes she now has a limp, don't move around as fast as she use to because her body is deteriorating. As long as she hasn't hurt a pt then she is fine. Its not our place to tell her she needs to retire because she makes the work load harder for others. That conversation needs to be taken up with the proper staff if you feel like a pt safety is in jeopardy. She has given her all to her career and i wish her the best because this will be a scary transition for her when she finally makes it.