If she’s just chilling and doesn’t appear to be in distress, I would just keep an eye out. Fun fact: Deer are really common in suburban areas, because they are adapted to live in areas around forest edges. Fragmented bits of forest (parks) in developed areas have lots of edges, and so deer thrive. This is also why you don’t get moose in the city: they’re more adapted to live in large, continuous areas of forest, and they don’t coexist super well with deer. Deer carry a brainworm that isn’t particularly harmful to them, but is fatal to moose. So they don’t really live together in the same areas.
My previous employer was located in an area with a fair number of forested parks around it, and we used to see deer all the time. I kind of miss them (I now work in a very dense urban area without deer, although there are certainly lots of raccoons!)