Welcome to the forums, I will try and answer some questions for you the best I can.
LBD is difficult disease and has many ups and downs, where you have applied for her to live will depend on how long she stays in present stage, Some with LBD have more of the mental decline and then others take on the physical decline and very possible both., I think for right now with just the mental decline you have a better chance of her getting into an Assisted living situation, but if she should start with the physical that could be another story many places won't take on people like that!
If you read many things on LBD some will say 5-7 yrs but I have known people their loved Ones have lived longer or less those numbers are just an average. As far as educating the community go to the Lewy Body web site and print the information and give it to them.
You spoke of a possible move for yourself I wouldn't jump to that just yet, try and take a step at a time and see if she does in fact get into this place and how it works out and at that point you can decide what needs to be done, I hope some of this has helped and come bak again if you have more questions that need answering!