What steps do I need to take to put my mother in a nursing home.

It is unfortunate that your mother's situation has deteriorated to this point. It sounds like there are serious health and safety issues involved and that she needs intervention for her own well-being.

My first suggestion would be for you to contact your county's social services office, and inquire about resources they have available. Here in California, our county's resources would include Adult Protective Services, who have a legal obligation to investigate reports of neglect or abuse involving the elderly. You can also see if there is an Area Agency on Aging (AAA) available in your area, which would be knowledgeable about other similar resources.

Finally, you may want to simply call the police. If your cousin isn't taking care of her properly, and there are concerns about neglect or physical or financial abuses, those are crimes and law enforcement should get involved.

Good Luck