I am sorry to hear about your problem.
Is the new house you moved into completely paid for, or did you take a mortgage?
Is your daughter married?
Thats ok Lynn, you can answer anytime at your convenience.
It's not uncommon for parents to talk to their children about their will and what will happen once they pass. What may not be as common is a child demanding a change in the will. On one hand, I can see that she feels that since she is the only child that maybe she deserves to have something when you pass. However one the other hand, she has her own husband and her own family. How would she feel if you asked to be in her will and get half of her house? How would her husband feel about that? You've been with your husband 13 years and shouldn't have to explain to anyone your reasons or what you plan to do when you pass.
I welcome your thoughts, let me know if you want to talk more