Adding a spouse to a deed?

My wife and I have an ongoing "disagreement" over her name being added to the deed to our property. We have lived together and been married for 6 years; No children. I bought the property and built a house on it several years before we met. Two years ago, I became disabled, and that left my wife with most of our financial burdens. She has been nagging ( that's a nice way of stating it) about having her name added to the deed. She feels that because I receive ssi payments, that the house would be taken away from her in the event of my ping. In addition to that, she's tired of paying toward something that she claims "isn't really hers". I would be elated, and sleep better at night if someone could give me some advice, or even a web sight link that would help. Thank You in advance