Don't freeze her, stick her in a sack with vinegar and baking soda, or attach a box with her in it to the tail pipe of a car! That's just disgusting. The broomstick and ax (or machete) are humane and lightning quick, but those first three are horrible. Ever put a bug in a jar as a kid with some sort of stuff (baking soda and vinegar, rubbing alchohol, etc) and watch how sick they get before they finally die? Doesn't look pleasant to me. And I had several that took 5 hours or more to kill in the freezer, and that's just with bugs. What seems better for the owner's not always what's best for the animal (and vice-versa,) that's for sure. Sorry for the rant but that just makes me cringe when people say those are good ways for animals to go. I have no problem with killing an animal, wether it's for food or it's sick, but making them suffer more than they have to just doesn't set well.
Bet you anything, most people are going to read the first two or three lines only and go ape, well go ahead, I'm just glad I'm not their livestock/pet is all.