Do not use essential oils around snakes or other reptiles. If possible do not have the room that the snake lives in sprayed with pesticide and do not bring the snake into any room that has been treated for several weeks (I honestly don't know the actual safe time frame here). If all rooms will be sprayed the snake will need to be removed from the apartment completely.
You can kill bed bugs with borax powder. Sprinkle the borax in carpets, across doorways and all along the edges of rooms and in corners. This treatment is 100% safe for reptiles as long as the reptiles do not come into contact with the borax (don't let your snake crawl on the floor where borax is). I have used this method in my reptile room to help control ants and other pest bugs.
ETA: Don't ever use the spray bottle with the alcohol/lavender mix in it for Cookie again. Get a new one.
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