that she might hurt herself, you probably want to keep her living at home. You may need to hire part time house care person.
People developing dementia will only ge worse. To care for them through this course of time is both demanding and tormenting.
It wil help if you read a couple of books on caring for family members with dememtia.
An important thing is to learn to distant yourself from the patient. She is a patient first, a family member second. As time moves on, the more of the first, the less the second.