I was searching a while back since this case is somewhat close to me.
Going back in time to check if water sources were accessible (or even there) I found 17 spots in a 5 mile radius from her last location. These are the closest ones in the direction she should have been traveling home but some might be too shallow, hard to say.
I looked into some of these further and here's what I've found so far...
#3 on your map (28.337759530915502, -81.5092578196365) seems like a really good place to start; if you zoom in on Google maps, the swampy area is much bigger than it seems. There is also a lot of greenery (looks to be trees, lily pads, etc) so I imagine it wasn’t/isn’t the easiest place to search and tire prints probably wouldn’t have lasted very long.
#4 on your map (28.3389818418782, -81.5048192770188) seems very unlikely since I believe it to be within the property of Falcon’s Fire Golf Course. It looks to be well-manicured and I know water on golf courses is often searched for lost golf balls (there are companies that specialize in this service).
#6 on your map (28.337754772874906, -81.53445340975577) seems like an easy place to spot something; it is owned by Vacation Village at Parkway and it has the “Vacation Village Nature Trail” crossing it (though in some photos on Google the water looks pretty green).
#8 on your map (28.336809864132608, -81.53208770141534) looks small but accessible from Arabian Nights Blvd. I can’t tell if it is owned by Vacation Village at Parkway or not.
#9 on your map (28.34139103537703, -81.53476149286772) has a fountain (not sure when it was installed/how often it is maintained). It seems to be on the property of Grand Hotel Kissimmee at Celebration, though I could be mistaken.
#10 on your map (28.341396937137628, -81.53275452997698) has a fountain (not sure when it was installed/how often it is maintained) and is owned by Vacation Village at Parkway.
#13 on your map (28.35452735329579, -81.5132653254608) has access from International Drive and is in an area with a lot of trees. I’m not sure if that area is owned/maintained by a company or by the city.
#14 on your map (28.353026828231528, -81.49906532673167) also has a fountain and seems to be owned by Camden World Gateway Apartments.
Those are the only labeled bodies of water I can see on that image, so I will go back and check your original post.
ETA: These are my findings based on the 2022 Google map.