You do it and have her watch.
You break out your mask with the combo organic vapor, dust, and radionuclides cartridge mounted, get a couple of stout plastic trash bags, you pick it up by laying one opened trash bag over it, and use your hands to kind of roll it up and into the other trash bag. Then seal up the outer bag.
I've had to get rid of a number of smellies in my day. That's the way to do it. Screw the $100. Just tell her you have to show her how to do it so if necessary someday, she can do it. Life is not all pink unicorns and pretty nail polish.
You can chase away some of the flies beforehand, or spray on them, but face the fact that this operation will involve some of them landing on you. I never used OFF! insect repellent on myself beforehand, so I don't know if that would work with flies.
You can let her feel like she contributed positively by having her hose off the area afterward. (If she doesn't want to, don't push it, you do it.)
By the way, you do have a respirator mask, don't you? About $40 at many lumber yards --not extremely useful, but if you need it, you'll be glad you have it. I'm not talking about the paper ones, which don't block out smellies. And barely block out particles. Useless as tits on a bull.
Terry, 230RN