I know she doesn't want to be in NOVA theoretically, but I really think she should consider being far closer than an hour from at least one of you. NOVA is really her best option to be close to family and it would really help her to not have to do two moves. Eventually, when she needs more support it will be so helpful to have one family member who doesn't have to go an hour. At least worth looking at some places.
My grandparents moved here to be closer to family and have been really happy at Westminster at Lake Ridge which is in Woodbridge. They chose it because you are able to get a small cottage (vs an apartment in closer in communities). Their cottage has a little patio, backing onto trees. Woodbridge is certainly "NOVA" and will have some of the parts she doesn't like, but with everything there in the community that helps. My grandparents still live independently in one of those cottages and they are in their 90's now.
https://inglesideonline.org/westminster-lake-ridge/