If my wife abandoned or removed herself from the household, am I obliged to provide for her?

Yes, I live in Illinois, have been married 3 years and 3 months. The children are mine from a previous marriage which was dissolved by the sudden death of my first wife 4 years and 2 months ago. My present wife moved out over the weekend without me knowing it until I came home. My kids did not even know it would happen. She did not leave me for another man, so I am not seeking a divorce now since there was no infidelity. I am trying to follow the Bible. She has an incurable illness and is receiving Social security since January this year and has kept this all for herself. So, I have provided for over 95% of her bills. Upon her departure, do I still have to provide for her? Should I close or remove all monies from joint accounts immediately since she does have debit cards to these or am I required by law to help her? I still love her but she did ask for a divorce a few months earlier, but this (her leaving) was all so sudden with no warning. I have never abused her in any way. Out of love, I want to help her, but I am sad and angry; but want not to be used either.