H.P.
Joelen, you and your family are in our prayers. My grandfather (who I was very close with) had Alzheimer's Disease and it was completely devistating to me and my family.
The only thing that I can think of that might help with the time and attention issues is to involve your kids with your mom's care. This might be difficult at first, but I think that when they see how you treat your mom with such care and respect, they will understand that is how you should treat people. That is what we did with my cousin (at first only by guilting her into it), and it made a huge difference to her and she was more able to deal with his death. She was able to give my grandmother some much needed help with his care.
I wish you the best and hope you can find a good adult home for her. While my grandfather was still mobile, we had him in an adult home, but it took 3 months for us to find a good one. I think it was a good thing to him too.
The only other thing that I can think that may help is when your mom's disease progresses continue to talk to her as you do now (and your kids too).
Something else to remember is that your mom will have good and bad days, as I am sure you already know. Just remembering that, and saying out loud was a small help on those bad days.
And remember to breathe...