I was wondering the same. I couldn’t find any mention of that. Maybe she walked in on a break-in. Although it’s considered safe, no gates in upscale neighborhoods are a lure for robbers. As a previous poster mentioned, regular workers might know she was going out that night.
Did she leave lights on for herself knowing she’d be out after dark? Did the family members who dropped her off walk her in or at least walk her to the door? She is of sound mind, but does have health issues. What did LE find at the scene that immediately raised red flags?
Perhaps when she got home she fell and hit her head at some point which caused bleeding and confusion and she wandered away.
Finding blood or disarray at a missing victim’s home will obviously call for a parallel investigation; one for the search for the victim and one for the reason why they are missing.