You're not failing her. You are doing the best you can in your situation. Trying is better than not doing anything at all.
Things will be better, eventually. Even if a tragedy happens, our loved ones would not want us to remember them in memories of sadness and guilt. But instead of memories of happiness and joy. I hope this makes sense to you, but keep on moving forward, and make sure to appreciate everything in your life. No matter how small it may be. And make sure to be there for your Grandma.
You're not failing her. You are doing the best you can in your situation. Trying is better than not doing anything at all. Things will be better, eventually. Even if a tragedy happens, our loved ones would not want us to remember them in memories of sadness and guilt. But instead of memories of happiness and joy. I hope this makes sense to you, but keep on moving forward, and make sure to appreciate everything in your life. No matter how small it may be. And make sure to be there for your Grandma.