I would never let my wife use a come-along to pull on a stuck tractor, even just as a stabilizer to prevent backsliding while I pushed myself out with the loader. I wouldn't even let a hired hand do that. It doesn't matter how good the come-along is -- even if it is made out of solid titanium and gold plated.
As mentioned, there are serious safety issues and she could be injured or killed.
Almost as good as a tow truck, and a lot less expensive, is a neighbor with a tractor and a chain. I have a good neighbor just down the road and we exchange favors all the time. When he needs a rock dug up, my backhoe does a much better job than his FEL. When I need to carry a bucket of redi-mix into the woods, his plain loader beats my 4-n-1.
It may be temporarily embarrassing to have to ask for help, especially when you know neighbor 1, will tell neighbor 2 about having to pull your tractor out of a swamp, gully, ravine, or whatever. But, this is the first stage of becoming part of the community.
Get to know the people around you. A few attentive neighbors are the best security system you can have. After a few years here, the folks in the community know what vehicles drive up to my house regularly, and if a strange one comes up the road they usually pay a little visit just to be sure everything is OK. I suppose if I ever get a new car/truck/vehicle of any sort, I will have to stop by most of their houses and tell them about it...