From everything I've read, her best solution to a rattlesnake bite is a radio transponder to call for medivac and get antivenin administered by professionals. The little suction doodads are worthless, at any rate.

Good boots and snake gaiters, on the other hand, are a good precaution. So are hiking poles, because they can poke before you step, and draw the ire of any potential nope rope to aluminum instead of flesh.