, you can do a lot of the initial research online, getting names of facilities / communities, looking up how they're rated by the agencies that monitor them, and so on. At some point, she's going to need to be formally assessed to determine what level of care she needs (independent living, some level of assisted living, or skilled nursing). But in the meantime, do you know whether she needs actually nursing care or just assistance with activities of daily living (ADL's)? That will help decide where she should go, because not all facilities offer all levels. Once you have a few places in mind, you're going to have to go out there and visit them.
It's been years since I did all this for my father, but I'll be glad to try answering any questions you may have.