No bombs or sprays will overcome irrational fear. What does she do when encountering a spider in her home? Move out, burn it down, sell it. Not trying to be funny or mean, but you need to ask the question. Then apply the answer to the RV. You could always get a nuclear bug bomb (no such thing) from eBay and let her know you set it off the day before you leave. Then give her a can of natural bug spray to carry with her in the RV at all times. Outside, it ain't gonna happen. This is a problem you need to decide if you can live with. The only other option is to give up camping and find another hobby. Or just stay home. Chuck