If your mother isn't very old and is in decent shape for her age, then my suggestion is for you to start researching living options for her future on your
If your mother is failing physically, however, you need to take action. There's the subtle approach: You can contact senior communities and have them send her their brochures or informational packets in the mail. She may throw them away, or she may actually open them -- you might be surprised. Then there's the backhanded approach: Enlist a friend to talk to her. Together they may get further along in the discussion than you would with your mother, because they don't have any "baggage." You might also contact a transitioning expert, who can sometimes work wonders. Finally, you can send your mother letters in the mail telling her how worried you are, and explaining that you don't want to see her get hurt and have to move somewhere she may not want to live.
Your last approach would be the tough-love angle. Outline what the consequences will be if something happens to her. Ask her if she wants control over her life, and if the answer is yes, then tell her that unless she faces her situation and makes her own choices now, she may not have a choice later. And tell her you may not have the capacity to come to her rescue all the time if she isn't willing to help you help her. This isn't an easy situation, but it's best to persevere if you really feel there's a danger to your mother.
own. This will bring you peace of mind but also give her space to make her own decisions while she's still capable. Sometimes we children let our fear get the best of us, and we put too much emphasis on what our parents "should" be doing. You can rest more easily by creating a plan now and putting it aside until you feel the time has come for serious consideration of a move.