Hmmmm. What about building an outdoor enclosure? Or getting one of those kitty strollers that are closed up? lol, look!

http://www.midnightpass.com/kitpetstrol.html

http://www.midnightpass.com/kitdecpatver.html

I agree that it is too risky to let her out there without some protection - either a harness or enclosure of some kind.