A.G.
Its usually better to change what you can on your side then to try and change someone else. She must have a reason for not taking a sick day, I'm sure she would rather be home too. I suggest you buy some hand sanitizer, wipes and spray as well as some Vitamin C pills. Keep you and your work area disinfected and take extra Vitamin C and you should be fine. No need to obviously spray down the office to erase her cooties. lol Before spraying maybe say something like no offense- I'm sure you would take a sick day if you could, but I just want to avoid getting sick also, it does not look like you're having fun!
Good luck!!
A.