Maximum security would be an M-4 loaded with a 30 round clip and bear spray mounted on a rail. This is no joke. It would take care of business for most women (and men), does not require much training, is light weight, possibly the least expensive, readily available rifle out there and the ammo is cheap. This rig is all purpose, easy to stow behind the truck seat, or inside the FWC, great for home defense too. When carried out in the open where two legged varmints can see it, they would give a wide berth, probably would not even get close enough to say "Howdy". Lets say they are high on something they are growing and don't see the rifle. They come up to assault you; poke em with the barrel, that is what the riot police are trained to do! And if you are worried about the power of the diminutive 5.56 round, AlJazerra says the favorite gun of African poachers is the AK-47. With it, they have just about killed all the elephants in Kenya. The AR based M-4 is, for all practical purposes, about the same as an AK but you could get an AK if you wanted, and for less money.
Look, life is a compromise. If you are really worried about being attacked, stay home. John D