I'm so sorry LG. Can you stay with her for a week or two so she can get in a home? Can you pay a in-home aide to stay with her until a spot opens up?
And it is time for YOU. You do what you want. Your H doesn't care about your feelings anyway, so if you want to go stay with her and spend some time with her, you do it. You decide what you want and what matters to you most.